// CodeMirror version 2.35
//
// All functions that need access to the editor's state live inside
// the CodeMirror function. Below that, at the bottom of the file,
// some utilities are defined.

// CodeMirror is the only global var we claim
window.CodeMirror = (function () {
    "use strict";
    // This is the function that produces an editor instance. Its
    // closure is used to store the editor state.
    function CodeMirror(place, givenOptions) {
        // Determine effective options based on given values and defaults.
        var options = {}, defaults = CodeMirror.defaults;
        for (var opt in defaults)
            if (defaults.hasOwnProperty(opt))
                options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];

        var input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em");
        input.setAttribute("wrap", "off");
        input.setAttribute("autocorrect", "off");
        input.setAttribute("autocapitalize", "off");
        // Wraps and hides input textarea
        var inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
        // The empty scrollbar content, used solely for managing the scrollbar thumb.
        var scrollbarInner = elt("div", null, "CodeMirror-scrollbar-inner");
        // The vertical scrollbar. Horizontal scrolling is handled by the scroller itself.
        var scrollbar = elt("div", [scrollbarInner], "CodeMirror-scrollbar");
        // DIVs containing the selection and the actual code
        var lineDiv = elt("div"), selectionDiv = elt("div", null, null, "position: relative; z-index: -1");
        // Blinky cursor, and element used to ensure cursor fits at the end of a line
        var cursor = elt("pre", "\u00a0", "CodeMirror-cursor"),
            widthForcer = elt("pre", "\u00a0", "CodeMirror-cursor", "visibility: hidden");
        // Used to measure text size
        var measure = elt("div", null, null, "position: absolute; width: 100%; height: 0px; overflow: hidden; visibility: hidden;");
        var lineSpace = elt("div", [measure, cursor, widthForcer, selectionDiv, lineDiv], null, "position: relative; z-index: 0");
        var gutterText = elt("div", null, "CodeMirror-gutter-text"),
            gutter = elt("div", [gutterText], "CodeMirror-gutter");
        // Moved around its parent to cover visible view
        var mover = elt("div", [gutter, elt("div", [lineSpace], "CodeMirror-lines")], null, "position: relative");
        // Set to the height of the text, causes scrolling
        var sizer = elt("div", [mover], null, "position: relative");
        // Provides scrolling
        var scroller = elt("div", [sizer], "CodeMirror-scroll");
        scroller.setAttribute("tabIndex", "-1");
        // The element in which the editor lives.
        var wrapper = elt("div", [inputDiv, scrollbar, scroller], "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : ""));
        if (place.appendChild) place.appendChild(wrapper); else place(wrapper);

        themeChanged();
        keyMapChanged();
        // Needed to hide big blue blinking cursor on Mobile Safari
        if (ios) input.style.width = "0px";
        if (!webkit) scroller.draggable = true;
        lineSpace.style.outline = "none";
        if (options.tabindex != null) input.tabIndex = options.tabindex;
        if (options.autofocus) focusInput();
        if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
        // Needed to handle Tab key in KHTML
        if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";

        // Check for OS X >= 10.7. This has transparent scrollbars, so the
        // overlaying of one scrollbar with another won't work. This is a
        // temporary hack to simply turn off the overlay scrollbar. See
        // issue #727.
        if (mac_geLion) {
            scrollbar.style.zIndex = -2;
            scrollbar.style.visibility = "hidden";
        }
        // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
        else if (ie_lt8) scrollbar.style.minWidth = "18px";

        // Delayed object wrap timeouts, making sure only one is active. blinker holds an interval.
        var poll = new Delayed(), highlight = new Delayed(), blinker;

        // mode holds a mode API object. doc is the tree of Line objects,
        // frontier is the point up to which the content has been parsed,
        // and history the undo history (instance of History constructor).
        var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), frontier = 0, focused;
        loadMode();
        // The selection. These are always maintained to point at valid
        // positions. Inverted is used to remember that the user is
        // selecting bottom-to-top.
        var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
        // Selection-related flags. shiftSelecting obviously tracks
        // whether the user is holding shift.
        var shiftSelecting, lastClick, lastDoubleClick, lastScrollTop = 0, draggingText,
            overwrite = false, suppressEdits = false, pasteIncoming = false;
        // Variables used by startOperation/endOperation to track what
        // happened during the operation.
        var updateInput, userSelChange, changes, textChanged, selectionChanged,
            gutterDirty, callbacks;
        // Current visible range (may be bigger than the view window).
        var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0;
        // bracketHighlighted is used to remember that a bracket has been
        // marked.
        var bracketHighlighted;
        // Tracks the maximum line length so that the horizontal scrollbar
        // can be kept static when scrolling.
        var maxLine = getLine(0), updateMaxLine = false, maxLineChanged = true;
        var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
        var goalColumn = null;

        // Initialize the content.
        operation(function () {
            setValue(options.value || "");
            updateInput = false;
        })();
        var history = new History();

        // Register our event handlers.
        connect(scroller, "mousedown", operation(onMouseDown));
        connect(scroller, "dblclick", operation(onDoubleClick));
        connect(lineSpace, "selectstart", e_preventDefault);
        // Gecko browsers fire contextmenu *after* opening the menu, at
        // which point we can't mess with it anymore. Context menu is
        // handled in onMouseDown for Gecko.
        if (!gecko) connect(scroller, "contextmenu", onContextMenu);
        connect(scroller, "scroll", onScrollMain);
        connect(scrollbar, "scroll", onScrollBar);
        connect(scrollbar, "mousedown", function () {
            if (focused) setTimeout(focusInput, 0);
        });
        var resizeHandler = connect(window, "resize", function () {
            if (wrapper.parentNode) updateDisplay(true);
            else resizeHandler();
        }, true);
        connect(input, "keyup", operation(onKeyUp));
        connect(input, "input", fastPoll);
        connect(input, "keydown", operation(onKeyDown));
        connect(input, "keypress", operation(onKeyPress));
        connect(input, "focus", onFocus);
        connect(input, "blur", onBlur);

        function drag_(e) {
            if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
            e_stop(e);
        }

        if (options.dragDrop) {
            connect(scroller, "dragstart", onDragStart);
            connect(scroller, "dragenter", drag_);
            connect(scroller, "dragover", drag_);
            connect(scroller, "drop", operation(onDrop));
        }
        connect(scroller, "paste", function () {
            focusInput();
            fastPoll();
        });
        connect(input, "paste", function () {
            pasteIncoming = true;
            fastPoll();
        });
        connect(input, "cut", operation(function () {
            if (!options.readOnly) replaceSelection("");
        }));

        // Needed to handle Tab key in KHTML
        if (khtml) connect(sizer, "mouseup", function () {
            if (document.activeElement == input) input.blur();
            focusInput();
        });

        // IE throws unspecified error in certain cases, when
        // trying to access activeElement before onload
        var hasFocus;
        try {
            hasFocus = (document.activeElement == input);
        } catch (e) {
        }
        if (hasFocus || options.autofocus) setTimeout(onFocus, 20);
        else onBlur();

        function isLine(l) {
            return l >= 0 && l < doc.size;
        }

        // The instance object that we'll return. Mostly calls out to
        // local functions in the CodeMirror function. Some do some extra
        // range checking and/or clipping. operation is used to wrap the
        // call so that changes it makes are tracked, and the display is
        // updated afterwards.
        var instance = wrapper.CodeMirror = {
            getValue: getValue,
            setValue: operation(setValue),
            getSelection: getSelection,
            replaceSelection: operation(replaceSelection),
            focus: function () {
                window.focus();
                focusInput();
                onFocus();
                fastPoll();
            },
            setOption: function (option, value) {
                var oldVal = options[option];
                options[option] = value;
                if (option == "mode" || option == "indentUnit") loadMode();
                else if (option == "readOnly" && value == "nocursor") {
                    onBlur();
                    input.blur();
                }
                else if (option == "readOnly" && !value) {
                    resetInput(true);
                }
                else if (option == "theme") themeChanged();
                else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
                else if (option == "tabSize") updateDisplay(true);
                else if (option == "keyMap") keyMapChanged();
                else if (option == "tabindex") input.tabIndex = value;
                if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" ||
                    option == "theme" || option == "lineNumberFormatter") {
                    gutterChanged();
                    updateDisplay(true);
                }
            },
            getOption: function (option) {
                return options[option];
            },
            getMode: function () {
                return mode;
            },
            undo: operation(undo),
            redo: operation(redo),
            indentLine: operation(function (n, dir) {
                if (typeof dir != "string") {
                    if (dir == null) dir = options.smartIndent ? "smart" : "prev";
                    else dir = dir ? "add" : "subtract";
                }
                if (isLine(n)) indentLine(n, dir);
            }),
            indentSelection: operation(indentSelected),
            historySize: function () {
                return {undo: history.done.length, redo: history.undone.length};
            },
            clearHistory: function () {
                history = new History();
            },
            setHistory: function (histData) {
                history = new History();
                history.done = histData.done;
                history.undone = histData.undone;
            },
            getHistory: function () {
                function cp(arr) {
                    for (var i = 0, nw = [], nwelt; i < arr.length; ++i) {
                        nw.push(nwelt = []);
                        for (var j = 0, elt = arr[i]; j < elt.length; ++j) {
                            var old = [], cur = elt[j];
                            nwelt.push({start: cur.start, added: cur.added, old: old});
                            for (var k = 0; k < cur.old.length; ++k) old.push(hlText(cur.old[k]));
                        }
                    }
                    return nw;
                }

                return {done: cp(history.done), undone: cp(history.undone)};
            },
            matchBrackets: operation(function () {
                matchBrackets(true);
            }),
            getTokenAt: operation(function (pos) {
                pos = clipPos(pos);
                return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), options.tabSize, pos.ch);
            }),
            getStateAfter: function (line) {
                line = clipLine(line == null ? doc.size - 1 : line);
                return getStateBefore(line + 1);
            },
            cursorCoords: function (start, mode) {
                if (start == null) start = sel.inverted;
                return this.charCoords(start ? sel.from : sel.to, mode);
            },
            charCoords: function (pos, mode) {
                pos = clipPos(pos);
                if (mode == "local") return localCoords(pos, false);
                if (mode == "div") return localCoords(pos, true);
                return pageCoords(pos);
            },
            coordsChar: function (coords) {
                var off = eltOffset(lineSpace);
                return coordsChar(coords.x - off.left, coords.y - off.top);
            },
            markText: operation(markText),
            setBookmark: setBookmark,
            findMarksAt: findMarksAt,
            setMarker: operation(addGutterMarker),
            clearMarker: operation(removeGutterMarker),
            setLineClass: operation(setLineClass),
            hideLine: operation(function (h) {
                return setLineHidden(h, true);
            }),
            showLine: operation(function (h) {
                return setLineHidden(h, false);
            }),
            onDeleteLine: function (line, f) {
                if (typeof line == "number") {
                    if (!isLine(line)) return null;
                    line = getLine(line);
                }
                (line.handlers || (line.handlers = [])).push(f);
                return line;
            },
            lineInfo: lineInfo,
            getViewport: function () {
                return {from: showingFrom, to: showingTo};
            },
            addWidget: function (pos, node, scroll, vert, horiz) {
                pos = localCoords(clipPos(pos));
                var top = pos.yBot, left = pos.x;
                node.style.position = "absolute";
                sizer.appendChild(node);
                if (vert == "over") top = pos.y;
                else if (vert == "near") {
                    var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()),
                        hspace = Math.max(sizer.clientWidth, lineSpace.clientWidth) - paddingLeft();
                    if (pos.yBot + node.offsetHeight > vspace && pos.y > node.offsetHeight)
                        top = pos.y - node.offsetHeight;
                    if (left + node.offsetWidth > hspace)
                        left = hspace - node.offsetWidth;
                }
                node.style.top = (top + paddingTop()) + "px";
                node.style.left = node.style.right = "";
                if (horiz == "right") {
                    left = sizer.clientWidth - node.offsetWidth;
                    node.style.right = "0px";
                } else {
                    if (horiz == "left") left = 0;
                    else if (horiz == "middle") left = (sizer.clientWidth - node.offsetWidth) / 2;
                    node.style.left = (left + paddingLeft()) + "px";
                }
                if (scroll)
                    scrollIntoView(left, top, left + node.offsetWidth, top + node.offsetHeight);
            },

            lineCount: function () {
                return doc.size;
            },
            clipPos: clipPos,
            getCursor: function (start) {
                if (start == null) start = sel.inverted;
                return copyPos(start ? sel.from : sel.to);
            },
            somethingSelected: function () {
                return !posEq(sel.from, sel.to);
            },
            setCursor: operation(function (line, ch, user) {
                if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch, user);
                else setCursor(line, ch, user);
            }),
            setSelection: operation(function (from, to, user) {
                (user ? setSelectionUser : setSelection)(clipPos(from), clipPos(to || from));
            }),
            getLine: function (line) {
                if (isLine(line)) return getLine(line).text;
            },
            getLineHandle: function (line) {
                if (isLine(line)) return getLine(line);
            },
            setLine: operation(function (line, text) {
                if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(line).text.length});
            }),
            removeLine: operation(function (line) {
                if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
            }),
            replaceRange: operation(replaceRange),
            getRange: function (from, to, lineSep) {
                return getRange(clipPos(from), clipPos(to), lineSep);
            },

            triggerOnKeyDown: operation(onKeyDown),
            execCommand: function (cmd) {
                return commands[cmd](instance);
            },
            // Stuff used by commands, probably not much use to outside code.
            moveH: operation(moveH),
            deleteH: operation(deleteH),
            moveV: operation(moveV),
            toggleOverwrite: function () {
                if (overwrite) {
                    overwrite = false;
                    cursor.className = cursor.className.replace(" CodeMirror-overwrite", "");
                } else {
                    overwrite = true;
                    cursor.className += " CodeMirror-overwrite";
                }
            },

            posFromIndex: function (off) {
                var lineNo = 0, ch;
                doc.iter(0, doc.size, function (line) {
                    var sz = line.text.length + 1;
                    if (sz > off) {
                        ch = off;
                        return true;
                    }
                    off -= sz;
                    ++lineNo;
                });
                return clipPos({line: lineNo, ch: ch});
            },
            indexFromPos: function (coords) {
                if (coords.line < 0 || coords.ch < 0) return 0;
                var index = coords.ch;
                doc.iter(0, coords.line, function (line) {
                    index += line.text.length + 1;
                });
                return index;
            },
            scrollTo: function (x, y) {
                if (x != null) scroller.scrollLeft = x;
                if (y != null) scrollbar.scrollTop = scroller.scrollTop = y;
                updateDisplay([]);
            },
            getScrollInfo: function () {
                return {
                    x: scroller.scrollLeft, y: scrollbar.scrollTop,
                    height: scrollbar.scrollHeight, width: scroller.scrollWidth
                };
            },
            setSize: function (width, height) {
                function interpret(val) {
                    val = String(val);
                    return /^\d+$/.test(val) ? val + "px" : val;
                }

                if (width != null) wrapper.style.width = interpret(width);
                if (height != null) scroller.style.height = interpret(height);
                instance.refresh();
            },

            operation: function (f) {
                return operation(f)();
            },
            compoundChange: function (f) {
                return compoundChange(f);
            },
            refresh: function () {
                updateDisplay(true, null, lastScrollTop);
                if (scrollbar.scrollHeight > lastScrollTop)
                    scrollbar.scrollTop = lastScrollTop;
            },
            getInputField: function () {
                return input;
            },
            getWrapperElement: function () {
                return wrapper;
            },
            getScrollerElement: function () {
                return scroller;
            },
            getGutterElement: function () {
                return gutter;
            }
        };

        function getLine(n) {
            return getLineAt(doc, n);
        }

        function updateLineHeight(line, height) {
            gutterDirty = true;
            var diff = height - line.height;
            for (var n = line; n; n = n.parent) n.height += diff;
        }

        function lineContent(line, wrapAt) {
            if (!line.styles)
                line.highlight(mode, line.stateAfter = getStateBefore(lineNo(line)), options.tabSize);
            return line.getContent(options.tabSize, wrapAt, options.lineWrapping);
        }

        function setValue(code) {
            var top = {line: 0, ch: 0};
            updateLines(top, {line: doc.size - 1, ch: getLine(doc.size - 1).text.length},
                splitLines(code), top, top);
            updateInput = true;
        }

        function getValue(lineSep) {
            var text = [];
            doc.iter(0, doc.size, function (line) {
                text.push(line.text);
            });
            return text.join(lineSep || "\n");
        }

        function onScrollBar(e) {
            if (scrollbar.scrollTop != lastScrollTop) {
                lastScrollTop = scroller.scrollTop = scrollbar.scrollTop;
                updateDisplay([]);
            }
        }

        function onScrollMain(e) {
            if (options.fixedGutter && gutter.style.left != scroller.scrollLeft + "px")
                gutter.style.left = scroller.scrollLeft + "px";
            if (scroller.scrollTop != lastScrollTop) {
                lastScrollTop = scroller.scrollTop;
                if (scrollbar.scrollTop != lastScrollTop)
                    scrollbar.scrollTop = lastScrollTop;
                updateDisplay([]);
            }
            if (options.onScroll) options.onScroll(instance);
        }

        function onMouseDown(e) {
            setShift(e_prop(e, "shiftKey"));
            // Check whether this is a click in a widget
            for (var n = e_target(e); n != wrapper; n = n.parentNode)
                if (n.parentNode == sizer && n != mover) return;

            // See if this is a click in the gutter
            for (var n = e_target(e); n != wrapper; n = n.parentNode)
                if (n.parentNode == gutterText) {
                    if (options.onGutterClick)
                        options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom, e);
                    return e_preventDefault(e);
                }

            var start = posFromMouse(e);

            switch (e_button(e)) {
                case 3:
                    if (gecko) onContextMenu(e);
                    return;
                case 2:
                    if (start) setCursor(start.line, start.ch, true);
                    setTimeout(focusInput, 20);
                    e_preventDefault(e);
                    return;
            }
            // For button 1, if it was clicked inside the editor
            // (posFromMouse returning non-null), we have to adjust the
            // selection.
            if (!start) {
                if (e_target(e) == scroller) e_preventDefault(e);
                return;
            }

            if (!focused) onFocus();

            var now = +new Date, type = "single";
            if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
                type = "triple";
                e_preventDefault(e);
                setTimeout(focusInput, 20);
                selectLine(start.line);
            } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
                type = "double";
                lastDoubleClick = {time: now, pos: start};
                e_preventDefault(e);
                var word = findWordAt(start);
                setSelectionUser(word.from, word.to);
            } else {
                lastClick = {time: now, pos: start};
            }

            function dragEnd(e2) {
                if (webkit) scroller.draggable = false;
                draggingText = false;
                up();
                drop();
                if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
                    e_preventDefault(e2);
                    setCursor(start.line, start.ch, true);
                    focusInput();
                }
            }

            var last = start, going;
            if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) &&
                !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {
                // Let the drag handler handle this.
                if (webkit) scroller.draggable = true;
                var up = connect(document, "mouseup", operation(dragEnd), true);
                var drop = connect(scroller, "drop", operation(dragEnd), true);
                draggingText = true;
                // IE's approach to draggable
                if (scroller.dragDrop) scroller.dragDrop();
                return;
            }
            e_preventDefault(e);
            if (type == "single") setCursor(start.line, start.ch, true);

            var startstart = sel.from, startend = sel.to;

            function doSelect(cur) {
                if (type == "single") {
                    setSelectionUser(start, cur);
                } else if (type == "double") {
                    var word = findWordAt(cur);
                    if (posLess(cur, startstart)) setSelectionUser(word.from, startend);
                    else setSelectionUser(startstart, word.to);
                } else if (type == "triple") {
                    if (posLess(cur, startstart)) setSelectionUser(startend, clipPos({line: cur.line, ch: 0}));
                    else setSelectionUser(startstart, clipPos({line: cur.line + 1, ch: 0}));
                }
            }

            function extend(e) {
                var cur = posFromMouse(e, true);
                if (cur && !posEq(cur, last)) {
                    if (!focused) onFocus();
                    last = cur;
                    doSelect(cur);
                    updateInput = false;
                    var visible = visibleLines();
                    if (cur.line >= visible.to || cur.line < visible.from)
                        going = setTimeout(operation(function () {
                            extend(e);
                        }), 150);
                }
            }

            function done(e) {
                clearTimeout(going);
                var cur = posFromMouse(e);
                if (cur) doSelect(cur);
                e_preventDefault(e);
                focusInput();
                updateInput = true;
                move();
                up();
            }

            var move = connect(document, "mousemove", operation(function (e) {
                clearTimeout(going);
                e_preventDefault(e);
                if (!ie && !e_button(e)) done(e);
                else extend(e);
            }), true);
            var up = connect(document, "mouseup", operation(done), true);
        }

        function onDoubleClick(e) {
            for (var n = e_target(e); n != wrapper; n = n.parentNode)
                if (n.parentNode == gutterText) return e_preventDefault(e);
            e_preventDefault(e);
        }

        function onDrop(e) {
            if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
            e_preventDefault(e);
            var pos = posFromMouse(e, true), files = e.dataTransfer.files;
            if (!pos || options.readOnly) return;
            if (files && files.length && window.FileReader && window.File) {
                var n = files.length, text = Array(n), read = 0;
                var loadFile = function (file, i) {
                    var reader = new FileReader;
                    reader.onload = function () {
                        text[i] = reader.result;
                        if (++read == n) {
                            pos = clipPos(pos);
                            operation(function () {
                                var end = replaceRange(text.join(""), pos, pos);
                                setSelectionUser(pos, end);
                            })();
                        }
                    };
                    reader.readAsText(file);
                };
                for (var i = 0; i < n; ++i) loadFile(files[i], i);
            } else {
                // Don't do a replace if the drop happened inside of the selected text.
                if (draggingText && !(posLess(pos, sel.from) || posLess(sel.to, pos))) return;
                try {
                    var text = e.dataTransfer.getData("Text");
                    if (text) {
                        compoundChange(function () {
                            var curFrom = sel.from, curTo = sel.to;
                            setSelectionUser(pos, pos);
                            if (draggingText) replaceRange("", curFrom, curTo);
                            replaceSelection(text);
                            focusInput();
                        });
                    }
                }
                catch (e) {
                }
            }
        }

        function onDragStart(e) {
            var txt = getSelection();
            e.dataTransfer.setData("Text", txt);

            // Use dummy image instead of default browsers image.
            if (e.dataTransfer.setDragImage)
                e.dataTransfer.setDragImage(elt('img'), 0, 0);
        }

        function doHandleBinding(bound, dropShift) {
            if (typeof bound == "string") {
                bound = commands[bound];
                if (!bound) return false;
            }
            var prevShift = shiftSelecting;
            try {
                if (options.readOnly) suppressEdits = true;
                if (dropShift) shiftSelecting = null;
                bound(instance);
            } catch (e) {
                if (e != Pass) throw e;
                return false;
            } finally {
                shiftSelecting = prevShift;
                suppressEdits = false;
            }
            return true;
        }

        var maybeTransition;

        function handleKeyBinding(e) {
            // Handle auto keymap transitions
            var startMap = getKeyMap(options.keyMap), next = startMap.auto;
            clearTimeout(maybeTransition);
            if (next && !isModifierKey(e)) maybeTransition = setTimeout(function () {
                if (getKeyMap(options.keyMap) == startMap) {
                    options.keyMap = (next.call ? next.call(null, instance) : next);
                }
            }, 50);

            var name = keyNames[e_prop(e, "keyCode")], handled = false;
            var flipCtrlCmd = opera && mac;
            if (name == null || e.altGraphKey) return false;
            if (e_prop(e, "altKey")) name = "Alt-" + name;
            if (e_prop(e, flipCtrlCmd ? "metaKey" : "ctrlKey")) name = "Ctrl-" + name;
            if (e_prop(e, flipCtrlCmd ? "ctrlKey" : "metaKey")) name = "Cmd-" + name;

            var stopped = false;

            function stop() {
                stopped = true;
            }

            if (e_prop(e, "shiftKey")) {
                handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
                        function (b) {
                            return doHandleBinding(b, true);
                        }, stop)
                    || lookupKey(name, options.extraKeys, options.keyMap, function (b) {
                        if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
                    }, stop);
            } else {
                handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop);
            }
            if (stopped) handled = false;
            if (handled) {
                e_preventDefault(e);
                restartBlink();
                if (ie) {
                    e.oldKeyCode = e.keyCode;
                    e.keyCode = 0;
                }
            }
            return handled;
        }

        function handleCharBinding(e, ch) {
            var handled = lookupKey("'" + ch + "'", options.extraKeys,
                options.keyMap, function (b) {
                    return doHandleBinding(b, true);
                });
            if (handled) {
                e_preventDefault(e);
                restartBlink();
            }
            return handled;
        }

        var lastStoppedKey = null;

        function onKeyDown(e) {
            if (!focused) onFocus();
            if (ie && e.keyCode == 27) {
                e.returnValue = false;
            }
            if (pollingFast) {
                if (readInput()) pollingFast = false;
            }
            if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
            var code = e_prop(e, "keyCode");
            // IE does strange things with escape.
            setShift(code == 16 || e_prop(e, "shiftKey"));
            // First give onKeyEvent option a chance to handle this.
            var handled = handleKeyBinding(e);
            if (opera) {
                lastStoppedKey = handled ? code : null;
                // Opera has no cut event... we try to at least catch the key combo
                if (!handled && code == 88 && e_prop(e, mac ? "metaKey" : "ctrlKey"))
                    replaceSelection("");
            }
        }

        function onKeyPress(e) {
            if (pollingFast) readInput();
            if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
            var keyCode = e_prop(e, "keyCode"), charCode = e_prop(e, "charCode");
            if (opera && keyCode == lastStoppedKey) {
                lastStoppedKey = null;
                e_preventDefault(e);
                return;
            }
            if (((opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(e)) return;
            var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
            if (options.electricChars && mode.electricChars && options.smartIndent && !options.readOnly) {
                if (mode.electricChars.indexOf(ch) > -1)
                    setTimeout(operation(function () {
                        indentLine(sel.to.line, "smart");
                    }), 75);
            }
            if (handleCharBinding(e, ch)) return;
            fastPoll();
        }

        function onKeyUp(e) {
            if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
            if (e_prop(e, "keyCode") == 16) shiftSelecting = null;
        }

        function onFocus() {
            if (options.readOnly == "nocursor") return;
            if (!focused) {
                if (options.onFocus) options.onFocus(instance);
                focused = true;
                if (scroller.className.search(/\bCodeMirror-focused\b/) == -1)
                    scroller.className += " CodeMirror-focused";
            }
            slowPoll();
            restartBlink();
        }

        function onBlur() {
            if (focused) {
                if (options.onBlur) options.onBlur(instance);
                focused = false;
                if (bracketHighlighted)
                    operation(function () {
                        if (bracketHighlighted) {
                            bracketHighlighted();
                            bracketHighlighted = null;
                        }
                    })();
                scroller.className = scroller.className.replace(" CodeMirror-focused", "");
            }
            clearInterval(blinker);
            setTimeout(function () {
                if (!focused) shiftSelecting = null;
            }, 150);
        }

        // Replace the range from from to to by the strings in newText.
        // Afterwards, set the selection to selFrom, selTo.
        function updateLines(from, to, newText, selFrom, selTo) {
            if (suppressEdits) return;
            var old = [];
            doc.iter(from.line, to.line + 1, function (line) {
                old.push(newHL(line.text, line.markedSpans));
            });
            if (history) {
                history.addChange(from.line, newText.length, old);
                while (history.done.length > options.undoDepth) history.done.shift();
            }
            var lines = updateMarkedSpans(hlSpans(old[0]), hlSpans(lst(old)), from.ch, to.ch, newText);
            updateLinesNoUndo(from, to, lines, selFrom, selTo);
        }

        function unredoHelper(from, to) {
            if (!from.length) return;
            var set = from.pop(), out = [];
            for (var i = set.length - 1; i >= 0; i -= 1) {
                var change = set[i];
                var replaced = [], end = change.start + change.added;
                doc.iter(change.start, end, function (line) {
                    replaced.push(newHL(line.text, line.markedSpans));
                });
                out.push({start: change.start, added: change.old.length, old: replaced});
                var pos = {
                    line: change.start + change.old.length - 1,
                    ch: editEnd(hlText(lst(replaced)), hlText(lst(change.old)))
                };
                updateLinesNoUndo({line: change.start, ch: 0}, {line: end - 1, ch: getLine(end - 1).text.length},
                    change.old, pos, pos);
            }
            updateInput = true;
            to.push(out);
        }

        function undo() {
            unredoHelper(history.done, history.undone);
        }

        function redo() {
            unredoHelper(history.undone, history.done);
        }

        function updateLinesNoUndo(from, to, lines, selFrom, selTo) {
            if (suppressEdits) return;
            var recomputeMaxLength = false, maxLineLength = maxLine.text.length;
            if (!options.lineWrapping)
                doc.iter(from.line, to.line + 1, function (line) {
                    if (!line.hidden && line.text.length == maxLineLength) {
                        recomputeMaxLength = true;
                        return true;
                    }
                });
            if (from.line != to.line || lines.length > 1) gutterDirty = true;

            var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(to.line);
            var lastHL = lst(lines);

            // First adjust the line structure
            if (from.ch == 0 && to.ch == 0 && hlText(lastHL) == "") {
                // This is a whole-line replace. Treated specially to make
                // sure line objects move the way they are supposed to.
                var added = [], prevLine = null;
                for (var i = 0, e = lines.length - 1; i < e; ++i)
                    added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));
                lastLine.update(lastLine.text, hlSpans(lastHL));
                if (nlines) doc.remove(from.line, nlines, callbacks);
                if (added.length) doc.insert(from.line, added);
            } else if (firstLine == lastLine) {
                if (lines.length == 1) {
                    firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]) + firstLine.text.slice(to.ch), hlSpans(lines[0]));
                } else {
                    for (var added = [], i = 1, e = lines.length - 1; i < e; ++i)
                        added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));
                    added.push(new Line(hlText(lastHL) + firstLine.text.slice(to.ch), hlSpans(lastHL)));
                    firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]), hlSpans(lines[0]));
                    doc.insert(from.line + 1, added);
                }
            } else if (lines.length == 1) {
                firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]) + lastLine.text.slice(to.ch), hlSpans(lines[0]));
                doc.remove(from.line + 1, nlines, callbacks);
            } else {
                var added = [];
                firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]), hlSpans(lines[0]));
                lastLine.update(hlText(lastHL) + lastLine.text.slice(to.ch), hlSpans(lastHL));
                for (var i = 1, e = lines.length - 1; i < e; ++i)
                    added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));
                if (nlines > 1) doc.remove(from.line + 1, nlines - 1, callbacks);
                doc.insert(from.line + 1, added);
            }
            if (options.lineWrapping) {
                var perLine = Math.max(5, scroller.clientWidth / charWidth() - 3);
                doc.iter(from.line, from.line + lines.length, function (line) {
                    if (line.hidden) return;
                    var guess = Math.ceil(line.text.length / perLine) || 1;
                    if (guess != line.height) updateLineHeight(line, guess);
                });
            } else {
                doc.iter(from.line, from.line + lines.length, function (line) {
                    var l = line.text;
                    if (!line.hidden && l.length > maxLineLength) {
                        maxLine = line;
                        maxLineLength = l.length;
                        maxLineChanged = true;
                        recomputeMaxLength = false;
                    }
                });
                if (recomputeMaxLength) updateMaxLine = true;
            }

            // Adjust frontier, schedule worker
            frontier = Math.min(frontier, from.line);
            startWorker(400);

            var lendiff = lines.length - nlines - 1;
            // Remember that these lines changed, for updating the display
            changes.push({from: from.line, to: to.line + 1, diff: lendiff});
            if (options.onChange) {
                // Normalize lines to contain only strings, since that's what
                // the change event handler expects
                for (var i = 0; i < lines.length; ++i)
                    if (typeof lines[i] != "string") lines[i] = lines[i].text;
                var changeObj = {from: from, to: to, text: lines};
                if (textChanged) {
                    for (var cur = textChanged; cur.next; cur = cur.next) {
                    }
                    cur.next = changeObj;
                } else textChanged = changeObj;
            }

            // Update the selection
            function updateLine(n) {
                return n <= Math.min(to.line, to.line + lendiff) ? n : n + lendiff;
            }

            setSelection(clipPos(selFrom), clipPos(selTo),
                updateLine(sel.from.line), updateLine(sel.to.line));
        }

        function needsScrollbar() {
            var realHeight = doc.height * textHeight() + 2 * paddingTop();
            return realHeight * .99 > scroller.offsetHeight ? realHeight : false;
        }

        function updateVerticalScroll(scrollTop) {
            var scrollHeight = needsScrollbar();
            scrollbar.style.display = scrollHeight ? "block" : "none";
            if (scrollHeight) {
                scrollbarInner.style.height = sizer.style.minHeight = scrollHeight + "px";
                scrollbar.style.height = scroller.clientHeight + "px";
                if (scrollTop != null) {
                    scrollbar.scrollTop = scroller.scrollTop = scrollTop;
                    // 'Nudge' the scrollbar to work around a Webkit bug where,
                    // in some situations, we'd end up with a scrollbar that
                    // reported its scrollTop (and looked) as expected, but
                    // *behaved* as if it was still in a previous state (i.e.
                    // couldn't scroll up, even though it appeared to be at the
                    // bottom).
                    if (webkit) setTimeout(function () {
                        if (scrollbar.scrollTop != scrollTop) return;
                        scrollbar.scrollTop = scrollTop + (scrollTop ? -1 : 1);
                        scrollbar.scrollTop = scrollTop;
                    }, 0);
                }
            } else {
                sizer.style.minHeight = "";
            }
            // Position the mover div to align with the current virtual scroll position
            mover.style.top = displayOffset * textHeight() + "px";
        }

        function computeMaxLength() {
            maxLine = getLine(0);
            maxLineChanged = true;
            var maxLineLength = maxLine.text.length;
            doc.iter(1, doc.size, function (line) {
                var l = line.text;
                if (!line.hidden && l.length > maxLineLength) {
                    maxLineLength = l.length;
                    maxLine = line;
                }
            });
            updateMaxLine = false;
        }

        function replaceRange(code, from, to) {
            from = clipPos(from);
            if (!to) to = from; else to = clipPos(to);
            code = splitLines(code);
            function adjustPos(pos) {
                if (posLess(pos, from)) return pos;
                if (!posLess(to, pos)) return end;
                var line = pos.line + code.length - (to.line - from.line) - 1;
                var ch = pos.ch;
                if (pos.line == to.line)
                    ch += lst(code).length - (to.ch - (to.line == from.line ? from.ch : 0));
                return {line: line, ch: ch};
            }

            var end;
            replaceRange1(code, from, to, function (end1) {
                end = end1;
                return {from: adjustPos(sel.from), to: adjustPos(sel.to)};
            });
            return end;
        }

        function replaceSelection(code, collapse) {
            replaceRange1(splitLines(code), sel.from, sel.to, function (end) {
                if (collapse == "end") return {from: end, to: end};
                else if (collapse == "start") return {from: sel.from, to: sel.from};
                else return {from: sel.from, to: end};
            });
        }

        function replaceRange1(code, from, to, computeSel) {
            var endch = code.length == 1 ? code[0].length + from.ch : lst(code).length;
            var newSel = computeSel({line: from.line + code.length - 1, ch: endch});
            updateLines(from, to, code, newSel.from, newSel.to);
        }

        function getRange(from, to, lineSep) {
            var l1 = from.line, l2 = to.line;
            if (l1 == l2) return getLine(l1).text.slice(from.ch, to.ch);
            var code = [getLine(l1).text.slice(from.ch)];
            doc.iter(l1 + 1, l2, function (line) {
                code.push(line.text);
            });
            code.push(getLine(l2).text.slice(0, to.ch));
            return code.join(lineSep || "\n");
        }

        function getSelection(lineSep) {
            return getRange(sel.from, sel.to, lineSep);
        }

        function slowPoll() {
            if (pollingFast) return;
            poll.set(options.pollInterval, function () {
                readInput();
                if (focused) slowPoll();
            });
        }

        function fastPoll() {
            var missed = false;
            pollingFast = true;
            function p() {
                var changed = readInput();
                if (!changed && !missed) {
                    missed = true;
                    poll.set(60, p);
                }
                else {
                    pollingFast = false;
                    slowPoll();
                }
            }

            poll.set(20, p);
        }

        // Previnput is a hack to work with IME. If we reset the textarea
        // on every change, that breaks IME. So we look for changes
        // compared to the previous content instead. (Modern browsers have
        // events that indicate IME taking place, but these are not widely
        // supported or compatible enough yet to rely on.)
        var prevInput = "";

        function readInput() {
            if (!focused || hasSelection(input) || options.readOnly) return false;
            var text = input.value;
            if (text == prevInput) return false;
            if (!nestedOperation) startOperation();
            shiftSelecting = null;
            var same = 0, l = Math.min(prevInput.length, text.length);
            while (same < l && prevInput[same] == text[same]) ++same;
            if (same < prevInput.length)
                sel.from = {line: sel.from.line, ch: sel.from.ch - (prevInput.length - same)};
            else if (overwrite && posEq(sel.from, sel.to) && !pasteIncoming)
                sel.to = {
                    line: sel.to.line,
                    ch: Math.min(getLine(sel.to.line).text.length, sel.to.ch + (text.length - same))
                };
            replaceSelection(text.slice(same), "end");
            if (text.length > 1000) {
                input.value = prevInput = "";
            }
            else prevInput = text;
            if (!nestedOperation) endOperation();
            pasteIncoming = false;
            return true;
        }

        function resetInput(user) {
            if (!posEq(sel.from, sel.to)) {
                prevInput = "";
                input.value = getSelection();
                if (focused) selectInput(input);
            } else if (user) prevInput = input.value = "";
        }

        function focusInput() {
            if (options.readOnly != "nocursor") input.focus();
        }

        function scrollCursorIntoView() {
            var coords = calculateCursorCoords();
            scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);
            if (!focused) return;
            var box = sizer.getBoundingClientRect(), doScroll = null;
            if (coords.y + box.top < 0) doScroll = true;
            else if (coords.y + box.top + textHeight() > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
            if (doScroll != null) {
                var hidden = cursor.style.display == "none";
                if (hidden) {
                    cursor.style.display = "";
                    cursor.style.left = coords.x + "px";
                    cursor.style.top = (coords.y - displayOffset) + "px";
                }
                cursor.scrollIntoView(doScroll);
                if (hidden) cursor.style.display = "none";
            }
        }

        function calculateCursorCoords() {
            var cursor = localCoords(sel.inverted ? sel.from : sel.to);
            var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x;
            return {x: x, y: cursor.y, yBot: cursor.yBot};
        }

        function scrollIntoView(x1, y1, x2, y2) {
            var scrollPos = calculateScrollPos(x1, y1, x2, y2);
            if (scrollPos.scrollLeft != null) {
                scroller.scrollLeft = scrollPos.scrollLeft;
            }
            if (scrollPos.scrollTop != null) {
                scrollbar.scrollTop = scroller.scrollTop = scrollPos.scrollTop;
            }
        }

        function calculateScrollPos(x1, y1, x2, y2) {
            var pl = paddingLeft(), pt = paddingTop();
            y1 += pt;
            y2 += pt;
            x1 += pl;
            x2 += pl;
            var screen = scroller.clientHeight, screentop = scrollbar.scrollTop, result = {};
            var docBottom = needsScrollbar() || Infinity;
            var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;
            if (y1 < screentop) result.scrollTop = atTop ? 0 : Math.max(0, y1);
            else if (y2 > screentop + screen) result.scrollTop = (atBottom ? docBottom : y2) - screen;

            var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
            var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
            var atLeft = x1 < gutterw + pl + 10;
            if (x1 < screenleft + gutterw || atLeft) {
                if (atLeft) x1 = 0;
                result.scrollLeft = Math.max(0, x1 - 10 - gutterw);
            } else if (x2 > screenw + screenleft - 3) {
                result.scrollLeft = x2 + 10 - screenw;
            }
            return result;
        }

        function visibleLines(scrollTop) {
            var lh = textHeight(), top = (scrollTop != null ? scrollTop : scrollbar.scrollTop) - paddingTop();
            var fromHeight = Math.max(0, Math.floor(top / lh));
            var toHeight = Math.ceil((top + scroller.clientHeight) / lh);
            return {
                from: lineAtHeight(doc, fromHeight),
                to: lineAtHeight(doc, toHeight)
            };
        }

        // Uses a set of changes plus the current scroll position to
        // determine which DOM updates have to be made, and makes the
        // updates.
        function updateDisplay(changes, suppressCallback, scrollTop) {
            if (!scroller.clientWidth) {
                showingFrom = showingTo = displayOffset = 0;
                return;
            }
            // Compute the new visible window
            // If scrollTop is specified, use that to determine which lines
            // to render instead of the current scrollbar position.
            var visible = visibleLines(scrollTop);
            // Bail out if the visible area is already rendered and nothing changed.
            if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) {
                updateVerticalScroll(scrollTop);
                return;
            }
            var from = Math.max(visible.from - 100, 0), to = Math.min(doc.size, visible.to + 100);
            if (showingFrom < from && from - showingFrom < 20) from = showingFrom;
            if (showingTo > to && showingTo - to < 20) to = Math.min(doc.size, showingTo);

            // Create a range of theoretically intact lines, and punch holes
            // in that using the change info.
            var intact = changes === true ? [] :
                computeIntact([{from: showingFrom, to: showingTo, domStart: 0}], changes);
            // Clip off the parts that won't be visible
            var intactLines = 0;
            for (var i = 0; i < intact.length; ++i) {
                var range = intact[i];
                if (range.from < from) {
                    range.domStart += (from - range.from);
                    range.from = from;
                }
                if (range.to > to) range.to = to;
                if (range.from >= range.to) intact.splice(i--, 1);
                else intactLines += range.to - range.from;
            }
            if (intactLines == to - from && from == showingFrom && to == showingTo) {
                updateVerticalScroll(scrollTop);
                return;
            }
            intact.sort(function (a, b) {
                return a.domStart - b.domStart;
            });

            var th = textHeight(), gutterDisplay = gutter.style.display;
            lineDiv.style.display = "none";
            patchDisplay(from, to, intact);
            lineDiv.style.display = gutter.style.display = "";

            var different = from != showingFrom || to != showingTo || lastSizeC != scroller.clientHeight + th;
            // This is just a bogus formula that detects when the editor is
            // resized or the font size changes.
            if (different) lastSizeC = scroller.clientHeight + th;
            if (from != showingFrom || to != showingTo && options.onViewportChange)
                setTimeout(function () {
                    if (options.onViewportChange) options.onViewportChange(instance, from, to);
                });
            showingFrom = from;
            showingTo = to;
            displayOffset = heightAtLine(doc, from);
            startWorker(100);

            // Since this is all rather error prone, it is honoured with the
            // only assertion in the whole file.
            if (lineDiv.childNodes.length != showingTo - showingFrom)
                throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (showingTo - showingFrom) +
                    " nodes=" + lineDiv.childNodes.length);

            function checkHeights() {
                var curNode = lineDiv.firstChild, heightChanged = false;
                doc.iter(showingFrom, showingTo, function (line) {
                    // Work around bizarro IE7 bug where, sometimes, our curNode
                    // is magically replaced with a new node in the DOM, leaving
                    // us with a reference to an orphan (nextSibling-less) node.
                    if (!curNode) return;
                    if (!line.hidden) {
                        var height = Math.round(curNode.offsetHeight / th) || 1;
                        if (line.height != height) {
                            updateLineHeight(line, height);
                            gutterDirty = heightChanged = true;
                        }
                    }
                    curNode = curNode.nextSibling;
                });
                return heightChanged;
            }

            if (options.lineWrapping) checkHeights();

            gutter.style.display = gutterDisplay;
            if (different || gutterDirty) {
                // If the gutter grew in size, re-check heights. If those changed, re-draw gutter.
                updateGutter() && options.lineWrapping && checkHeights() && updateGutter();
            }
            updateVerticalScroll(scrollTop);
            updateSelection();
            if (!suppressCallback && options.onUpdate) options.onUpdate(instance);
            return true;
        }

        function computeIntact(intact, changes) {
            for (var i = 0, l = changes.length || 0; i < l; ++i) {
                var change = changes[i], intact2 = [], diff = change.diff || 0;
                for (var j = 0, l2 = intact.length; j < l2; ++j) {
                    var range = intact[j];
                    if (change.to <= range.from && change.diff)
                        intact2.push({
                            from: range.from + diff, to: range.to + diff,
                            domStart: range.domStart
                        });
                    else if (change.to <= range.from || change.from >= range.to)
                        intact2.push(range);
                    else {
                        if (change.from > range.from)
                            intact2.push({from: range.from, to: change.from, domStart: range.domStart});
                        if (change.to < range.to)
                            intact2.push({
                                from: change.to + diff, to: range.to + diff,
                                domStart: range.domStart + (change.to - range.from)
                            });
                    }
                }
                intact = intact2;
            }
            return intact;
        }

        function patchDisplay(from, to, intact) {
            function killNode(node) {
                var tmp = node.nextSibling;
                node.parentNode.removeChild(node);
                return tmp;
            }

            // The first pass removes the DOM nodes that aren't intact.
            if (!intact.length) removeChildren(lineDiv);
            else {
                var domPos = 0, curNode = lineDiv.firstChild, n;
                for (var i = 0; i < intact.length; ++i) {
                    var cur = intact[i];
                    while (cur.domStart > domPos) {
                        curNode = killNode(curNode);
                        domPos++;
                    }
                    for (var j = 0, e = cur.to - cur.from; j < e; ++j) {
                        curNode = curNode.nextSibling;
                        domPos++;
                    }
                }
                while (curNode) curNode = killNode(curNode);
            }
            // This pass fills in the lines that actually changed.
            var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
            doc.iter(from, to, function (line) {
                if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
                if (!nextIntact || nextIntact.from > j) {
                    if (line.hidden) var lineElement = elt("pre");
                    else {
                        var lineElement = lineContent(line);
                        if (line.className) lineElement.className = line.className;
                        // Kludge to make sure the styled element lies behind the selection (by z-index)
                        if (line.bgClassName) {
                            var pre = elt("pre", "\u00a0", line.bgClassName, "position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2");
                            lineElement = elt("div", [pre, lineElement], null, "position: relative");
                        }
                    }
                    lineDiv.insertBefore(lineElement, curNode);
                } else {
                    curNode = curNode.nextSibling;
                }
                ++j;
            });
        }

        function updateGutter() {
            if (!options.gutter && !options.lineNumbers) return;
            var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
            gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
            var fragment = document.createDocumentFragment(), i = showingFrom, normalNode;
            doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function (line) {
                if (line.hidden) {
                    fragment.appendChild(elt("pre"));
                } else {
                    var marker = line.gutterMarker;
                    var text = options.lineNumbers ? options.lineNumberFormatter(i + options.firstLineNumber) : null;
                    if (marker && marker.text)
                        text = marker.text.replace("%N%", text != null ? text : "");
                    else if (text == null)
                        text = "\u00a0";
                    var markerElement = fragment.appendChild(elt("pre", null, marker && marker.style));
                    markerElement.innerHTML = text;
                    for (var j = 1; j < line.height; ++j) {
                        markerElement.appendChild(elt("br"));
                        markerElement.appendChild(document.createTextNode("\u00a0"));
                    }
                    if (!marker) normalNode = i;
                }
                ++i;
            });
            gutter.style.display = "none";
            removeChildrenAndAdd(gutterText, fragment);
            // Make sure scrolling doesn't cause number gutter size to pop
            if (normalNode != null && options.lineNumbers) {
                var node = gutterText.childNodes[normalNode - showingFrom];
                var minwidth = String(doc.size).length, val = eltText(node.firstChild), pad = "";
                while (val.length + pad.length < minwidth) pad += "\u00a0";
                if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
            }
            gutter.style.display = "";
            var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.offsetWidth) > 2;
            lineSpace.style.marginLeft = gutter.offsetWidth + "px";
            gutterDirty = false;
            return resized;
        }

        function updateSelection() {
            var collapsed = posEq(sel.from, sel.to);
            var fromPos = localCoords(sel.from, true);
            var toPos = collapsed ? fromPos : localCoords(sel.to, true);
            var headPos = sel.inverted ? fromPos : toPos, th = textHeight();
            var wrapOff = eltOffset(wrapper), lineOff = eltOffset(lineDiv);
            inputDiv.style.top = Math.max(0, Math.min(scroller.offsetHeight, headPos.y + lineOff.top - wrapOff.top)) + "px";
            inputDiv.style.left = Math.max(0, Math.min(scroller.offsetWidth, headPos.x + lineOff.left - wrapOff.left)) + "px";
            if (collapsed) {
                cursor.style.top = headPos.y + "px";
                cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.offsetWidth) : headPos.x) + "px";
                cursor.style.display = "";
                selectionDiv.style.display = "none";
            } else {
                var sameLine = fromPos.y == toPos.y, fragment = document.createDocumentFragment();
                var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
                var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;
                var add = function (left, top, right, height) {
                    var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
                        : "right: " + right + "px";
                    fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
                        "px; top: " + top + "px; " + rstyle + "; height: " + height + "px"));
                };
                if (sel.from.ch && fromPos.y >= 0) {
                    var right = sameLine ? clientWidth - toPos.x : 0;
                    add(fromPos.x, fromPos.y, right, th);
                }
                var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
                var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
                if (middleHeight > 0.2 * th)
                    add(0, middleStart, 0, middleHeight);
                if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
                    add(0, toPos.y, clientWidth - toPos.x, th);
                removeChildrenAndAdd(selectionDiv, fragment);
                cursor.style.display = "none";
                selectionDiv.style.display = "";
            }
        }

        function setShift(val) {
            if (val) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
            else shiftSelecting = null;
        }

        function setSelectionUser(from, to) {
            var sh = shiftSelecting && clipPos(shiftSelecting);
            if (sh) {
                if (posLess(sh, from)) from = sh;
                else if (posLess(to, sh)) to = sh;
            }
            setSelection(from, to);
            userSelChange = true;
        }

        // Update the selection. Last two args are only used by
        // updateLines, since they have to be expressed in the line
        // numbers before the update.
        function setSelection(from, to, oldFrom, oldTo) {
            goalColumn = null;
            if (oldFrom == null) {
                oldFrom = sel.from.line;
                oldTo = sel.to.line;
            }
            if (posEq(sel.from, from) && posEq(sel.to, to)) return;
            if (posLess(to, from)) {
                var tmp = to;
                to = from;
                from = tmp;
            }

            // Skip over hidden lines.
            if (from.line != oldFrom) {
                var from1 = skipHidden(from, oldFrom, sel.from.ch);
                // If there is no non-hidden line left, force visibility on current line
                if (!from1) setLineHidden(from.line, false);
                else from = from1;
            }
            if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);

            if (posEq(from, to)) sel.inverted = false;
            else if (posEq(from, sel.to)) sel.inverted = false;
            else if (posEq(to, sel.from)) sel.inverted = true;

            if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
                var head = sel.inverted ? from : to;
                if (head.line != sel.from.line && sel.from.line < doc.size) {
                    var oldLine = getLine(sel.from.line);
                    if (/^\s+$/.test(oldLine.text))
                        setTimeout(operation(function () {
                            if (oldLine.parent && /^\s+$/.test(oldLine.text)) {
                                var no = lineNo(oldLine);
                                replaceRange("", {line: no, ch: 0}, {line: no, ch: oldLine.text.length});
                            }
                        }, 10));
                }
            }

            sel.from = from;
            sel.to = to;
            selectionChanged = true;
        }

        function skipHidden(pos, oldLine, oldCh) {
            function getNonHidden(dir) {
                var lNo = pos.line + dir, end = dir == 1 ? doc.size : -1;
                while (lNo != end) {
                    var line = getLine(lNo);
                    if (!line.hidden) {
                        var ch = pos.ch;
                        if (toEnd || ch > oldCh || ch > line.text.length) ch = line.text.length;
                        return {line: lNo, ch: ch};
                    }
                    lNo += dir;
                }
            }

            var line = getLine(pos.line);
            var toEnd = pos.ch == line.text.length && pos.ch != oldCh;
            if (!line.hidden) return pos;
            if (pos.line >= oldLine) return getNonHidden(1) || getNonHidden(-1);
            else return getNonHidden(-1) || getNonHidden(1);
        }

        function setCursor(line, ch, user) {
            var pos = clipPos({line: line, ch: ch || 0});
            (user ? setSelectionUser : setSelection)(pos, pos);
        }

        function clipLine(n) {
            return Math.max(0, Math.min(n, doc.size - 1));
        }

        function clipPos(pos) {
            if (pos.line < 0) return {line: 0, ch: 0};
            if (pos.line >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
            var ch = pos.ch, linelen = getLine(pos.line).text.length;
            if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
            else if (ch < 0) return {line: pos.line, ch: 0};
            else return pos;
        }

        function findPosH(dir, unit) {
            var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;
            var lineObj = getLine(line);

            function findNextLine() {
                for (var l = line + dir, e = dir < 0 ? -1 : doc.size; l != e; l += dir) {
                    var lo = getLine(l);
                    if (!lo.hidden) {
                        line = l;
                        lineObj = lo;
                        return true;
                    }
                }
            }

            function moveOnce(boundToLine) {
                if (ch == (dir < 0 ? 0 : lineObj.text.length)) {
                    if (!boundToLine && findNextLine()) ch = dir < 0 ? lineObj.text.length : 0;
                    else return false;
                } else ch += dir;
                return true;
            }

            if (unit == "char") moveOnce();
            else if (unit == "column") moveOnce(true);
            else if (unit == "word") {
                var sawWord = false;
                for (; ;) {
                    if (dir < 0) if (!moveOnce()) break;
                    if (isWordChar(lineObj.text.charAt(ch))) sawWord = true;
                    else if (sawWord) {
                        if (dir < 0) {
                            dir = 1;
                            moveOnce();
                        }
                        break;
                    }
                    if (dir > 0) if (!moveOnce()) break;
                }
            }
            return {line: line, ch: ch};
        }

        function moveH(dir, unit) {
            var pos = dir < 0 ? sel.from : sel.to;
            if (shiftSelecting || posEq(sel.from, sel.to)) pos = findPosH(dir, unit);
            setCursor(pos.line, pos.ch, true);
        }

        function deleteH(dir, unit) {
            if (!posEq(sel.from, sel.to)) replaceRange("", sel.from, sel.to);
            else if (dir < 0) replaceRange("", findPosH(dir, unit), sel.to);
            else replaceRange("", sel.from, findPosH(dir, unit));
            userSelChange = true;
        }

        function moveV(dir, unit) {
            var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
            if (goalColumn != null) pos.x = goalColumn;
            if (unit == "page") {
                var screen = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
                var target = coordsChar(pos.x, pos.y + screen * dir);
            } else if (unit == "line") {
                var th = textHeight();
                var target = coordsChar(pos.x, pos.y + .5 * th + dir * th);
            }
            if (unit == "page") scrollbar.scrollTop += localCoords(target, true).y - pos.y;
            setCursor(target.line, target.ch, true);
            goalColumn = pos.x;
        }

        function findWordAt(pos) {
            var line = getLine(pos.line).text;
            var start = pos.ch, end = pos.ch;
            if (line) {
                if (pos.after === false || end == line.length) --start; else ++end;
                var startChar = line.charAt(start);
                var check = isWordChar(startChar) ? isWordChar :
                    /\s/.test(startChar) ? function (ch) {
                        return /\s/.test(ch);
                    } :
                        function (ch) {
                            return !/\s/.test(ch) && isWordChar(ch);
                        };
                while (start > 0 && check(line.charAt(start - 1))) --start;
                while (end < line.length && check(line.charAt(end))) ++end;
            }
            return {from: {line: pos.line, ch: start}, to: {line: pos.line, ch: end}};
        }

        function selectLine(line) {
            setSelectionUser({line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
        }

        function indentSelected(mode) {
            if (posEq(sel.from, sel.to)) return indentLine(sel.from.line, mode);
            var e = sel.to.line - (sel.to.ch ? 0 : 1);
            for (var i = sel.from.line; i <= e; ++i) indentLine(i, mode);
        }

        function indentLine(n, how) {
            if (!how) how = "add";
            if (how == "smart") {
                if (!mode.indent) how = "prev";
                else var state = getStateBefore(n);
            }

            var line = getLine(n), curSpace = line.indentation(options.tabSize),
                curSpaceString = line.text.match(/^\s*/)[0], indentation;
            if (how == "smart") {
                indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);
                if (indentation == Pass) how = "prev";
            }
            if (how == "prev") {
                if (n) indentation = getLine(n - 1).indentation(options.tabSize);
                else indentation = 0;
            }
            else if (how == "add") indentation = curSpace + options.indentUnit;
            else if (how == "subtract") indentation = curSpace - options.indentUnit;
            indentation = Math.max(0, indentation);
            var diff = indentation - curSpace;

            var indentString = "", pos = 0;
            if (options.indentWithTabs)
                for (var i = Math.floor(indentation / options.tabSize); i; --i) {
                    pos += options.tabSize;
                    indentString += "\t";
                }
            if (pos < indentation) indentString += spaceStr(indentation - pos);

            if (indentString != curSpaceString)
                replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
            line.stateAfter = null;
        }

        function loadMode() {
            mode = CodeMirror.getMode(options, options.mode);
            doc.iter(0, doc.size, function (line) {
                line.stateAfter = null;
            });
            frontier = 0;
            startWorker(100);
        }

        function gutterChanged() {
            var visible = options.gutter || options.lineNumbers;
            gutter.style.display = visible ? "" : "none";
            if (visible) gutterDirty = true;
            else lineDiv.parentNode.style.marginLeft = 0;
        }

        function wrappingChanged(from, to) {
            if (options.lineWrapping) {
                wrapper.className += " CodeMirror-wrap";
                var perLine = scroller.clientWidth / charWidth() - 3;
                doc.iter(0, doc.size, function (line) {
                    if (line.hidden) return;
                    var guess = Math.ceil(line.text.length / perLine) || 1;
                    if (guess != 1) updateLineHeight(line, guess);
                });
                lineSpace.style.minWidth = widthForcer.style.left = "";
            } else {
                wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
                computeMaxLength();
                doc.iter(0, doc.size, function (line) {
                    if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
                });
            }
            changes.push({from: 0, to: doc.size});
        }

        function themeChanged() {
            scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
                options.theme.replace(/(^|\s)\s*/g, " cm-s-");
        }

        function keyMapChanged() {
            var style = keyMap[options.keyMap].style;
            wrapper.className = wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
                (style ? " cm-keymap-" + style : "");
        }

        function TextMarker(type, style) {
            this.lines = [];
            this.type = type;
            if (style) this.style = style;
        }

        TextMarker.prototype.clear = operation(function () {
            var min, max;
            for (var i = 0; i < this.lines.length; ++i) {
                var line = this.lines[i];
                var span = getMarkedSpanFor(line.markedSpans, this);
                if (span.from != null) min = lineNo(line);
                if (span.to != null) max = lineNo(line);
                line.markedSpans = removeMarkedSpan(line.markedSpans, span);
            }
            if (min != null) changes.push({from: min, to: max + 1});
            this.lines.length = 0;
            this.explicitlyCleared = true;
        });
        TextMarker.prototype.find = function () {
            var from, to;
            for (var i = 0; i < this.lines.length; ++i) {
                var line = this.lines[i];
                var span = getMarkedSpanFor(line.markedSpans, this);
                if (span.from != null || span.to != null) {
                    var found = lineNo(line);
                    if (span.from != null) from = {line: found, ch: span.from};
                    if (span.to != null) to = {line: found, ch: span.to};
                }
            }
            if (this.type == "bookmark") return from;
            return from && {from: from, to: to};
        };

        function markText(from, to, className, options) {
            from = clipPos(from);
            to = clipPos(to);
            var marker = new TextMarker("range", className);
            if (options) for (var opt in options) if (options.hasOwnProperty(opt))
                marker[opt] = options[opt];
            var curLine = from.line;
            doc.iter(curLine, to.line + 1, function (line) {
                var span = {
                    from: curLine == from.line ? from.ch : null,
                    to: curLine == to.line ? to.ch : null,
                    marker: marker
                };
                line.markedSpans = (line.markedSpans || []).concat([span]);
                marker.lines.push(line);
                ++curLine;
            });
            changes.push({from: from.line, to: to.line + 1});
            return marker;
        }

        function setBookmark(pos) {
            pos = clipPos(pos);
            var marker = new TextMarker("bookmark"), line = getLine(pos.line);
            history.addChange(pos.line, 1, [newHL(line.text, line.markedSpans)], true);
            var span = {from: pos.ch, to: pos.ch, marker: marker};
            line.markedSpans = (line.markedSpans || []).concat([span]);
            marker.lines.push(line);
            return marker;
        }

        function findMarksAt(pos) {
            pos = clipPos(pos);
            var markers = [], spans = getLine(pos.line).markedSpans;
            if (spans) for (var i = 0; i < spans.length; ++i) {
                var span = spans[i];
                if ((span.from == null || span.from <= pos.ch) &&
                    (span.to == null || span.to >= pos.ch))
                    markers.push(span.marker);
            }
            return markers;
        }

        function addGutterMarker(line, text, className) {
            if (typeof line == "number") line = getLine(clipLine(line));
            line.gutterMarker = {text: text, style: className};
            gutterDirty = true;
            return line;
        }

        function removeGutterMarker(line) {
            if (typeof line == "number") line = getLine(clipLine(line));
            line.gutterMarker = null;
            gutterDirty = true;
        }

        function changeLine(handle, op) {
            var no = handle, line = handle;
            if (typeof handle == "number") line = getLine(clipLine(handle));
            else no = lineNo(handle);
            if (no == null) return null;
            if (op(line, no)) changes.push({from: no, to: no + 1});
            else return null;
            return line;
        }

        function setLineClass(handle, className, bgClassName) {
            return changeLine(handle, function (line) {
                if (line.className != className || line.bgClassName != bgClassName) {
                    line.className = className;
                    line.bgClassName = bgClassName;
                    return true;
                }
            });
        }

        function setLineHidden(handle, hidden) {
            return changeLine(handle, function (line, no) {
                if (line.hidden != hidden) {
                    line.hidden = hidden;
                    if (!options.lineWrapping) {
                        if (hidden && line.text.length == maxLine.text.length) {
                            updateMaxLine = true;
                        } else if (!hidden && line.text.length > maxLine.text.length) {
                            maxLine = line;
                            updateMaxLine = false;
                        }
                    }
                    updateLineHeight(line, hidden ? 0 : 1);
                    var fline = sel.from.line, tline = sel.to.line;
                    if (hidden && (fline == no || tline == no)) {
                        var from = fline == no ? skipHidden({line: fline, ch: 0}, fline, 0) : sel.from;
                        var to = tline == no ? skipHidden({line: tline, ch: 0}, tline, 0) : sel.to;
                        // Can't hide the last visible line, we'd have no place to put the cursor
                        if (!to) return;
                        setSelection(from, to);
                    }
                    return (gutterDirty = true);
                }
            });
        }

        function lineInfo(line) {
            if (typeof line == "number") {
                if (!isLine(line)) return null;
                var n = line;
                line = getLine(line);
                if (!line) return null;
            } else {
                var n = lineNo(line);
                if (n == null) return null;
            }
            var marker = line.gutterMarker;
            return {
                line: n, handle: line, text: line.text, markerText: marker && marker.text,
                markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName
            };
        }

        function measureLine(line, ch) {
            if (ch == 0) return {top: 0, left: 0};
            var pre = lineContent(line, ch);
            removeChildrenAndAdd(measure, pre);
            var anchor = pre.anchor;
            var top = anchor.offsetTop, left = anchor.offsetLeft;
            // Older IEs report zero offsets for spans directly after a wrap
            if (ie && top == 0 && left == 0) {
                var backup = elt("span", "x");
                anchor.parentNode.insertBefore(backup, anchor.nextSibling);
                top = backup.offsetTop;
            }
            return {top: top, left: left};
        }

        function localCoords(pos, inLineWrap) {
            var x, lh = textHeight(), y = lh * (heightAtLine(doc, pos.line) - (inLineWrap ? displayOffset : 0));
            if (pos.ch == 0) x = 0;
            else {
                var sp = measureLine(getLine(pos.line), pos.ch);
                x = sp.left;
                if (options.lineWrapping) y += Math.max(0, sp.top);
            }
            return {x: x, y: y, yBot: y + lh};
        }

        // Coords must be lineSpace-local
        function coordsChar(x, y) {
            var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
            if (heightPos < 0) return {line: 0, ch: 0};
            var lineNo = lineAtHeight(doc, heightPos);
            if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
            var lineObj = getLine(lineNo), text = lineObj.text;
            var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
            if (x <= 0 && innerOff == 0) return {line: lineNo, ch: 0};
            var wrongLine = false;

            function getX(len) {
                var sp = measureLine(lineObj, len);
                if (tw) {
                    var off = Math.round(sp.top / th);
                    wrongLine = off != innerOff;
                    return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
                }
                return sp.left;
            }

            var from = 0, fromX = 0, to = text.length, toX;
            // Guess a suitable upper bound for our search.
            var estimated = Math.min(to, Math.ceil((x + innerOff * scroller.clientWidth * .9) / cw));
            for (; ;) {
                var estX = getX(estimated);
                if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
                else {
                    toX = estX;
                    to = estimated;
                    break;
                }
            }
            if (x > toX) return {line: lineNo, ch: to};
            // Try to guess a suitable lower bound as well.
            estimated = Math.floor(to * 0.8);
            estX = getX(estimated);
            if (estX < x) {
                from = estimated;
                fromX = estX;
            }
            // Do a binary search between these bounds.
            for (; ;) {
                if (to - from <= 1) {
                    var after = x - fromX < toX - x;
                    return {line: lineNo, ch: after ? from : to, after: after};
                }
                var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
                if (middleX > x) {
                    to = middle;
                    toX = middleX;
                    if (wrongLine) toX += 1000;
                }
                else {
                    from = middle;
                    fromX = middleX;
                }
            }
        }

        function pageCoords(pos) {
            var local = localCoords(pos, true), off = eltOffset(lineSpace);
            return {x: off.left + local.x, y: off.top + local.y, yBot: off.top + local.yBot};
        }

        var cachedHeight, cachedHeightFor, measurePre;

        function textHeight() {
            if (measurePre == null) {
                measurePre = elt("pre");
                for (var i = 0; i < 49; ++i) {
                    measurePre.appendChild(document.createTextNode("x"));
                    measurePre.appendChild(elt("br"));
                }
                measurePre.appendChild(document.createTextNode("x"));
            }
            var offsetHeight = lineDiv.clientHeight;
            if (offsetHeight == cachedHeightFor) return cachedHeight;
            cachedHeightFor = offsetHeight;
            removeChildrenAndAdd(measure, measurePre.cloneNode(true));
            cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
            removeChildren(measure);
            return cachedHeight;
        }

        var cachedWidth, cachedWidthFor = 0;

        function charWidth() {
            if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
            cachedWidthFor = scroller.clientWidth;
            var anchor = elt("span", "x");
            var pre = elt("pre", [anchor]);
            removeChildrenAndAdd(measure, pre);
            return (cachedWidth = anchor.offsetWidth || 10);
        }

        function paddingTop() {
            return lineSpace.offsetTop;
        }

        function paddingLeft() {
            return lineSpace.offsetLeft;
        }

        function posFromMouse(e, liberal) {
            var offW = eltOffset(scroller, true), x, y;
            // Fails unpredictably on IE[67] when mouse is dragged around quickly.
            try {
                x = e.clientX;
                y = e.clientY;
            } catch (e) {
                return null;
            }
            // This is a mess of a heuristic to try and determine whether a
            // scroll-bar was clicked or not, and to return null if one was
            // (and !liberal).
            if (!liberal && (x - offW.left > scroller.clientWidth || y - offW.top > scroller.clientHeight))
                return null;
            var offL = eltOffset(lineSpace, true);
            return coordsChar(x - offL.left, y - offL.top);
        }

        var detectingSelectAll;

        function onContextMenu(e) {
            var pos = posFromMouse(e), scrollPos = scrollbar.scrollTop;
            if (!pos || opera) return; // Opera is difficult.
            if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
                operation(setCursor)(pos.line, pos.ch);

            var oldCSS = input.style.cssText;
            inputDiv.style.position = "absolute";
            input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
                "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
                "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
            focusInput();
            resetInput(true);
            // Adds "Select all" to context menu in FF
            if (posEq(sel.from, sel.to)) input.value = prevInput = " ";

            function rehide() {
                inputDiv.style.position = "relative";
                input.style.cssText = oldCSS;
                if (ie_lt9) scrollbar.scrollTop = scrollPos;
                slowPoll();

                // Try to detect the user choosing select-all
                if (input.selectionStart != null) {
                    clearTimeout(detectingSelectAll);
                    var extval = input.value = " " + (posEq(sel.from, sel.to) ? "" : input.value), i = 0;
                    prevInput = " ";
                    input.selectionStart = 1;
                    input.selectionEnd = extval.length;
                    detectingSelectAll = setTimeout(function poll() {
                        if (prevInput == " " && input.selectionStart == 0)
                            operation(commands.selectAll)(instance);
                        else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);
                        else resetInput();
                    }, 200);
                }
            }

            if (gecko) {
                e_stop(e);
                var mouseup = connect(window, "mouseup", function () {
                    mouseup();
                    setTimeout(rehide, 20);
                }, true);
            } else {
                setTimeout(rehide, 50);
            }
        }

        // Cursor-blinking
        function restartBlink() {
            clearInterval(blinker);
            var on = true;
            cursor.style.visibility = "";
            blinker = setInterval(function () {
                cursor.style.visibility = (on = !on) ? "" : "hidden";
            }, options.cursorBlinkRate);
        }

        var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};

        function matchBrackets(autoclear) {
            var head = sel.inverted ? sel.from : sel.to, line = getLine(head.line), pos = head.ch - 1;
            var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
            if (!match) return;
            var ch = match.charAt(0), forward = match.charAt(1) == ">", d = forward ? 1 : -1, st = line.styles;
            for (var off = pos + 1, i = 0, e = st.length; i < e; i += 2)
                if ((off -= st[i].length) <= 0) {
                    var style = st[i + 1];
                    break;
                }

            var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;

            function scan(line, from, to) {
                if (!line.text) return;
                var st = line.styles, pos = forward ? 0 : line.text.length - 1, cur;
                for (var i = forward ? 0 : st.length - 2, e = forward ? st.length : -2; i != e; i += 2 * d) {
                    var text = st[i];
                    if (st[i + 1] != style) {
                        pos += d * text.length;
                        continue;
                    }
                    for (var j = forward ? 0 : text.length - 1, te = forward ? text.length : -1; j != te; j += d, pos += d) {
                        if (pos >= from && pos < to && re.test(cur = text.charAt(j))) {
                            var match = matching[cur];
                            if (match.charAt(1) == ">" == forward) stack.push(cur);
                            else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
                            else if (!stack.length) return {pos: pos, match: true};
                        }
                    }
                }
            }

            for (var i = head.line, e = forward ? Math.min(i + 100, doc.size) : Math.max(-1, i - 100); i != e; i += d) {
                var line = getLine(i), first = i == head.line;
                var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
                if (found) break;
            }
            if (!found) found = {pos: null, match: false};
            var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
            var one = markText({line: head.line, ch: pos}, {line: head.line, ch: pos + 1}, style),
                two = found.pos != null && markText({line: i, ch: found.pos}, {line: i, ch: found.pos + 1}, style);
            var clear = operation(function () {
                one.clear();
                two && two.clear();
            });
            if (autoclear) setTimeout(clear, 800);
            else bracketHighlighted = clear;
        }

        // Finds the line to start with when starting a parse. Tries to
        // find a line with a stateAfter, so that it can start with a
        // valid state. If that fails, it returns the line with the
        // smallest indentation, which tends to need the least context to
        // parse correctly.
        function findStartLine(n) {
            var minindent, minline;
            for (var search = n, lim = n - 40; search > lim; --search) {
                if (search == 0) return 0;
                var line = getLine(search - 1);
                if (line.stateAfter) return search;
                var indented = line.indentation(options.tabSize);
                if (minline == null || minindent > indented) {
                    minline = search - 1;
                    minindent = indented;
                }
            }
            return minline;
        }

        function getStateBefore(n) {
            var pos = findStartLine(n), state = pos && getLine(pos - 1).stateAfter;
            if (!state) state = startState(mode);
            else state = copyState(mode, state);
            doc.iter(pos, n, function (line) {
                line.process(mode, state, options.tabSize);
                line.stateAfter = (pos == n - 1 || pos % 5 == 0) ? copyState(mode, state) : null;
            });
            return state;
        }

        function highlightWorker() {
            if (frontier >= showingTo) return;
            var end = +new Date + options.workTime, state = copyState(mode, getStateBefore(frontier));
            var startFrontier = frontier;
            doc.iter(frontier, showingTo, function (line) {
                if (frontier >= showingFrom) { // Visible
                    line.highlight(mode, state, options.tabSize);
                    line.stateAfter = copyState(mode, state);
                } else {
                    line.process(mode, state, options.tabSize);
                    line.stateAfter = frontier % 5 == 0 ? copyState(mode, state) : null;
                }
                ++frontier;
                if (+new Date > end) {
                    startWorker(options.workDelay);
                    return true;
                }
            });
            if (showingTo > startFrontier && frontier >= showingFrom)
                operation(function () {
                    changes.push({from: startFrontier, to: frontier});
                })();
        }

        function startWorker(time) {
            if (frontier < showingTo)
                highlight.set(time, highlightWorker);
        }

        // Operations are used to wrap changes in such a way that each
        // change won't have to update the cursor and display (which would
        // be awkward, slow, and error-prone), but instead updates are
        // batched and then all combined and executed at once.
        function startOperation() {
            updateInput = userSelChange = textChanged = null;
            changes = [];
            selectionChanged = false;
            callbacks = [];
        }

        function endOperation() {
            if (updateMaxLine) computeMaxLength();
            if (maxLineChanged && !options.lineWrapping) {
                var cursorWidth = widthForcer.offsetWidth, left = measureLine(maxLine, maxLine.text.length).left;
                if (!ie_lt8) {
                    widthForcer.style.left = left + "px";
                    lineSpace.style.minWidth = (left + cursorWidth) + "px";
                }
                maxLineChanged = false;
            }
            var newScrollPos, updated;
            if (selectionChanged) {
                var coords = calculateCursorCoords();
                newScrollPos = calculateScrollPos(coords.x, coords.y, coords.x, coords.yBot);
            }
            if (changes.length || newScrollPos && newScrollPos.scrollTop != null)
                updated = updateDisplay(changes, true, newScrollPos && newScrollPos.scrollTop);
            if (!updated) {
                if (selectionChanged) updateSelection();
                if (gutterDirty) updateGutter();
            }
            if (newScrollPos) scrollCursorIntoView();
            if (selectionChanged) restartBlink();

            if (focused && (updateInput === true || (updateInput !== false && selectionChanged)))
                resetInput(userSelChange);

            if (selectionChanged && options.matchBrackets)
                setTimeout(operation(function () {
                    if (bracketHighlighted) {
                        bracketHighlighted();
                        bracketHighlighted = null;
                    }
                    if (posEq(sel.from, sel.to)) matchBrackets(false);
                }), 20);
            var sc = selectionChanged, cbs = callbacks; // these can be reset by callbacks
            if (textChanged && options.onChange && instance)
                options.onChange(instance, textChanged);
            if (sc && options.onCursorActivity)
                options.onCursorActivity(instance);
            for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
            if (updated && options.onUpdate) options.onUpdate(instance);
        }

        var nestedOperation = 0;

        function operation(f) {
            return function () {
                if (!nestedOperation++) startOperation();
                try {
                    var result = f.apply(this, arguments);
                }
                finally {
                    if (!--nestedOperation) endOperation();
                }
                return result;
            };
        }

        function compoundChange(f) {
            history.startCompound();
            try {
                return f();
            } finally {
                history.endCompound();
            }
        }

        for (var ext in extensions)
            if (extensions.propertyIsEnumerable(ext) &&
                !instance.propertyIsEnumerable(ext))
                instance[ext] = extensions[ext];
        for (var i = 0; i < initHooks.length; ++i) initHooks[i](instance);
        return instance;
    } // (end of function CodeMirror)

    // The default configuration options.
    CodeMirror.defaults = {
        value: "",
        mode: null,
        theme: "default",
        indentUnit: 2,
        indentWithTabs: false,
        smartIndent: true,
        tabSize: 4,
        keyMap: "default",
        extraKeys: null,
        electricChars: true,
        autoClearEmptyLines: false,
        onKeyEvent: null,
        onDragEvent: null,
        lineWrapping: false,
        lineNumbers: false,
        gutter: false,
        fixedGutter: false,
        firstLineNumber: 1,
        readOnly: false,
        dragDrop: true,
        onChange: null,
        onCursorActivity: null,
        onViewportChange: null,
        onGutterClick: null,
        onUpdate: null,
        onFocus: null, onBlur: null, onScroll: null,
        matchBrackets: false,
        cursorBlinkRate: 530,
        workTime: 100,
        workDelay: 200,
        pollInterval: 100,
        undoDepth: 40,
        tabindex: null,
        autofocus: null,
        lineNumberFormatter: function (integer) {
            return integer;
        }
    };

    var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
    var mac = ios || /Mac/.test(navigator.platform);
    var win = /Win/.test(navigator.platform);

    // Known modes, by name and by MIME
    var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
    CodeMirror.defineMode = function (name, mode) {
        if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
        if (arguments.length > 2) {
            mode.dependencies = [];
            for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
        }
        modes[name] = mode;
    };
    CodeMirror.defineMIME = function (mime, spec) {
        mimeModes[mime] = spec;
    };
    CodeMirror.resolveMode = function (spec) {
        if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
            spec = mimeModes[spec];
        else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec))
            return CodeMirror.resolveMode("application/xml");
        if (typeof spec == "string") return {name: spec};
        else return spec || {name: "null"};
    };
    CodeMirror.getMode = function (options, spec) {
        var spec = CodeMirror.resolveMode(spec);
        var mfactory = modes[spec.name];
        if (!mfactory) return CodeMirror.getMode(options, "text/plain");
        var modeObj = mfactory(options, spec);
        if (modeExtensions.hasOwnProperty(spec.name)) {
            var exts = modeExtensions[spec.name];
            for (var prop in exts) if (exts.hasOwnProperty(prop)) modeObj[prop] = exts[prop];
        }
        modeObj.name = spec.name;
        return modeObj;
    };
    CodeMirror.listModes = function () {
        var list = [];
        for (var m in modes)
            if (modes.propertyIsEnumerable(m)) list.push(m);
        return list;
    };
    CodeMirror.listMIMEs = function () {
        var list = [];
        for (var m in mimeModes)
            if (mimeModes.propertyIsEnumerable(m)) list.push({mime: m, mode: mimeModes[m]});
        return list;
    };

    var extensions = CodeMirror.extensions = {};
    CodeMirror.defineExtension = function (name, func) {
        extensions[name] = func;
    };

    var initHooks = [];
    CodeMirror.defineInitHook = function (f) {
        initHooks.push(f);
    };

    var modeExtensions = CodeMirror.modeExtensions = {};
    CodeMirror.extendMode = function (mode, properties) {
        var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
        for (var prop in properties) if (properties.hasOwnProperty(prop))
            exts[prop] = properties[prop];
    };

    var commands = CodeMirror.commands = {
        selectAll: function (cm) {
            cm.setSelection({line: 0, ch: 0}, {line: cm.lineCount() - 1});
        },
        killLine: function (cm) {
            var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
            if (!sel && cm.getLine(from.line).length == from.ch) cm.replaceRange("", from, {
                line: from.line + 1,
                ch: 0
            });
            else cm.replaceRange("", from, sel ? to : {line: from.line});
        },
        deleteLine: function (cm) {
            var l = cm.getCursor().line;
            cm.replaceRange("", {line: l, ch: 0}, {line: l});
        },
        undo: function (cm) {
            cm.undo();
        },
        redo: function (cm) {
            cm.redo();
        },
        goDocStart: function (cm) {
            cm.setCursor(0, 0, true);
        },
        goDocEnd: function (cm) {
            cm.setSelection({line: cm.lineCount() - 1}, null, true);
        },
        goLineStart: function (cm) {
            cm.setCursor(cm.getCursor().line, 0, true);
        },
        goLineStartSmart: function (cm) {
            var cur = cm.getCursor();
            var text = cm.getLine(cur.line), firstNonWS = Math.max(0, text.search(/\S/));
            cm.setCursor(cur.line, cur.ch <= firstNonWS && cur.ch ? 0 : firstNonWS, true);
        },
        goLineEnd: function (cm) {
            cm.setSelection({line: cm.getCursor().line}, null, true);
        },
        goLineUp: function (cm) {
            cm.moveV(-1, "line");
        },
        goLineDown: function (cm) {
            cm.moveV(1, "line");
        },
        goPageUp: function (cm) {
            cm.moveV(-1, "page");
        },
        goPageDown: function (cm) {
            cm.moveV(1, "page");
        },
        goCharLeft: function (cm) {
            cm.moveH(-1, "char");
        },
        goCharRight: function (cm) {
            cm.moveH(1, "char");
        },
        goColumnLeft: function (cm) {
            cm.moveH(-1, "column");
        },
        goColumnRight: function (cm) {
            cm.moveH(1, "column");
        },
        goWordLeft: function (cm) {
            cm.moveH(-1, "word");
        },
        goWordRight: function (cm) {
            cm.moveH(1, "word");
        },
        delCharLeft: function (cm) {
            cm.deleteH(-1, "char");
        },
        delCharRight: function (cm) {
            cm.deleteH(1, "char");
        },
        delWordLeft: function (cm) {
            cm.deleteH(-1, "word");
        },
        delWordRight: function (cm) {
            cm.deleteH(1, "word");
        },
        indentAuto: function (cm) {
            cm.indentSelection("smart");
        },
        indentMore: function (cm) {
            cm.indentSelection("add");
        },
        indentLess: function (cm) {
            cm.indentSelection("subtract");
        },
        insertTab: function (cm) {
            cm.replaceSelection("\t", "end");
        },
        defaultTab: function (cm) {
            if (cm.somethingSelected()) cm.indentSelection("add");
            else cm.replaceSelection("\t", "end");
        },
        transposeChars: function (cm) {
            var cur = cm.getCursor(), line = cm.getLine(cur.line);
            if (cur.ch > 0 && cur.ch < line.length - 1)
                cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
                    {line: cur.line, ch: cur.ch - 1}, {line: cur.line, ch: cur.ch + 1});
        },
        newlineAndIndent: function (cm) {
            cm.replaceSelection("\n", "end");
            cm.indentLine(cm.getCursor().line);
        },
        toggleOverwrite: function (cm) {
            cm.toggleOverwrite();
        }
    };

    var keyMap = CodeMirror.keyMap = {};
    keyMap.basic = {
        "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
        "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
        "Delete": "delCharRight", "Backspace": "delCharLeft", "Tab": "defaultTab", "Shift-Tab": "indentAuto",
        "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
    };
    // Note that the save and find-related commands aren't defined by
    // default. Unknown commands are simply ignored.
    keyMap.pcDefault = {
        "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
        "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
        "Ctrl-Left": "goWordLeft", "Ctrl-Right": "goWordRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
        "Ctrl-Backspace": "delWordLeft", "Ctrl-Delete": "delWordRight", "Ctrl-S": "save", "Ctrl-F": "find",
        "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
        "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
        fallthrough: "basic"
    };
    keyMap.macDefault = {
        "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
        "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goWordLeft",
        "Alt-Right": "goWordRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delWordLeft",
        "Ctrl-Alt-Backspace": "delWordRight", "Alt-Delete": "delWordRight", "Cmd-S": "save", "Cmd-F": "find",
        "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
        "Cmd-[": "indentLess", "Cmd-]": "indentMore",
        fallthrough: ["basic", "emacsy"]
    };
    keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
    keyMap.emacsy = {
        "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
        "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
        "Ctrl-V": "goPageUp", "Shift-Ctrl-V": "goPageDown", "Ctrl-D": "delCharRight", "Ctrl-H": "delCharLeft",
        "Alt-D": "delWordRight", "Alt-Backspace": "delWordLeft", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
    };

    function getKeyMap(val) {
        if (typeof val == "string") return keyMap[val];
        else return val;
    }

    function lookupKey(name, extraMap, map, handle, stop) {
        function lookup(map) {
            map = getKeyMap(map);
            var found = map[name];
            if (found === false) {
                if (stop) stop();
                return true;
            }
            if (found != null && handle(found)) return true;
            if (map.nofallthrough) {
                if (stop) stop();
                return true;
            }
            var fallthrough = map.fallthrough;
            if (fallthrough == null) return false;
            if (Object.prototype.toString.call(fallthrough) != "[object Array]")
                return lookup(fallthrough);
            for (var i = 0, e = fallthrough.length; i < e; ++i) {
                if (lookup(fallthrough[i])) return true;
            }
            return false;
        }

        if (extraMap && lookup(extraMap)) return true;
        return lookup(map);
    }

    function isModifierKey(event) {
        var name = keyNames[e_prop(event, "keyCode")];
        return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
    }

    CodeMirror.isModifierKey = isModifierKey;

    CodeMirror.fromTextArea = function (textarea, options) {
        if (!options) options = {};
        options.value = textarea.value;
        if (!options.tabindex && textarea.tabindex)
            options.tabindex = textarea.tabindex;
        // Set autofocus to true if this textarea is focused, or if it has
        // autofocus and no other element is focused.
        if (options.autofocus == null) {
            var hasFocus = document.body;
            // doc.activeElement occasionally throws on IE
            try {
                hasFocus = document.activeElement;
            } catch (e) {
            }
            options.autofocus = hasFocus == textarea ||
                textarea.getAttribute("autofocus") != null && hasFocus == document.body;
        }

        function save() {
            textarea.value = instance.getValue();
        }

        if (textarea.form) {
            // Deplorable hack to make the submit method do the right thing.
            var rmSubmit = connect(textarea.form, "submit", save, true);
            if (typeof textarea.form.submit == "function") {
                var realSubmit = textarea.form.submit;
                textarea.form.submit = function wrappedSubmit() {
                    save();
                    textarea.form.submit = realSubmit;
                    textarea.form.submit();
                    textarea.form.submit = wrappedSubmit;
                };
            }
        }

        textarea.style.display = "none";
        var instance = CodeMirror(function (node) {
            textarea.parentNode.insertBefore(node, textarea.nextSibling);
        }, options);
        instance.save = save;
        instance.getTextArea = function () {
            return textarea;
        };
        instance.toTextArea = function () {
            save();
            textarea.parentNode.removeChild(instance.getWrapperElement());
            textarea.style.display = "";
            if (textarea.form) {
                rmSubmit();
                if (typeof textarea.form.submit == "function")
                    textarea.form.submit = realSubmit;
            }
        };
        return instance;
    };

    var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
    var ie = /MSIE \d/.test(navigator.userAgent);
    var ie_lt8 = /MSIE [1-7]\b/.test(navigator.userAgent);
    var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
    var quirksMode = ie && document.documentMode == 5;
    var webkit = /WebKit\//.test(navigator.userAgent);
    var chrome = /Chrome\//.test(navigator.userAgent);
    var opera = /Opera\//.test(navigator.userAgent);
    var safari = /Apple Computer/.test(navigator.vendor);
    var khtml = /KHTML\//.test(navigator.userAgent);
    var mac_geLion = /Mac OS X 10\D([7-9]|\d\d)\D/.test(navigator.userAgent);

    // Utility functions for working with state. Exported because modes
    // sometimes need to do this.
    function copyState(mode, state) {
        if (state === true) return state;
        if (mode.copyState) return mode.copyState(state);
        var nstate = {};
        for (var n in state) {
            var val = state[n];
            if (val instanceof Array) val = val.concat([]);
            nstate[n] = val;
        }
        return nstate;
    }

    CodeMirror.copyState = copyState;
    function startState(mode, a1, a2) {
        return mode.startState ? mode.startState(a1, a2) : true;
    }

    CodeMirror.startState = startState;
    CodeMirror.innerMode = function (mode, state) {
        while (mode.innerMode) {
            var info = mode.innerMode(state);
            state = info.state;
            mode = info.mode;
        }
        return info || {mode: mode, state: state};
    };

    // The character stream used by a mode's parser.
    function StringStream(string, tabSize) {
        this.pos = this.start = 0;
        this.string = string;
        this.tabSize = tabSize || 8;
    }

    StringStream.prototype = {
        eol: function () {
            return this.pos >= this.string.length;
        },
        sol: function () {
            return this.pos == 0;
        },
        peek: function () {
            return this.string.charAt(this.pos) || undefined;
        },
        next: function () {
            if (this.pos < this.string.length)
                return this.string.charAt(this.pos++);
        },
        eat: function (match) {
            var ch = this.string.charAt(this.pos);
            if (typeof match == "string") var ok = ch == match;
            else var ok = ch && (match.test ? match.test(ch) : match(ch));
            if (ok) {
                ++this.pos;
                return ch;
            }
        },
        eatWhile: function (match) {
            var start = this.pos;
            while (this.eat(match)) {
            }
            return this.pos > start;
        },
        eatSpace: function () {
            var start = this.pos;
            while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
            return this.pos > start;
        },
        skipToEnd: function () {
            this.pos = this.string.length;
        },
        skipTo: function (ch) {
            var found = this.string.indexOf(ch, this.pos);
            if (found > -1) {
                this.pos = found;
                return true;
            }
        },
        backUp: function (n) {
            this.pos -= n;
        },
        column: function () {
            return countColumn(this.string, this.start, this.tabSize);
        },
        indentation: function () {
            return countColumn(this.string, null, this.tabSize);
        },
        match: function (pattern, consume, caseInsensitive) {
            if (typeof pattern == "string") {
                var cased = function (str) {
                    return caseInsensitive ? str.toLowerCase() : str;
                };
                if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
                    if (consume !== false) this.pos += pattern.length;
                    return true;
                }
            } else {
                var match = this.string.slice(this.pos).match(pattern);
                if (match && match.index > 0) return null;
                if (match && consume !== false) this.pos += match[0].length;
                return match;
            }
        },
        current: function () {
            return this.string.slice(this.start, this.pos);
        }
    };
    CodeMirror.StringStream = StringStream;

    function MarkedSpan(from, to, marker) {
        this.from = from;
        this.to = to;
        this.marker = marker;
    }

    function getMarkedSpanFor(spans, marker) {
        if (spans) for (var i = 0; i < spans.length; ++i) {
            var span = spans[i];
            if (span.marker == marker) return span;
        }
    }

    function removeMarkedSpan(spans, span) {
        var r;
        for (var i = 0; i < spans.length; ++i)
            if (spans[i] != span) (r || (r = [])).push(spans[i]);
        return r;
    }

    function markedSpansBefore(old, startCh, endCh) {
        if (old) for (var i = 0, nw; i < old.length; ++i) {
            var span = old[i], marker = span.marker;
            var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
            if (startsBefore || marker.type == "bookmark" && span.from == startCh && span.from != endCh) {
                var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
                (nw || (nw = [])).push({
                    from: span.from,
                    to: endsAfter ? null : span.to,
                    marker: marker
                });
            }
        }
        return nw;
    }

    function markedSpansAfter(old, endCh) {
        if (old) for (var i = 0, nw; i < old.length; ++i) {
            var span = old[i], marker = span.marker;
            var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
            if (endsAfter || marker.type == "bookmark" && span.from == endCh) {
                var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
                (nw || (nw = [])).push({
                    from: startsBefore ? null : span.from - endCh,
                    to: span.to == null ? null : span.to - endCh,
                    marker: marker
                });
            }
        }
        return nw;
    }

    function updateMarkedSpans(oldFirst, oldLast, startCh, endCh, newText) {
        if (!oldFirst && !oldLast) return newText;
        // Get the spans that 'stick out' on both sides
        var first = markedSpansBefore(oldFirst, startCh);
        var last = markedSpansAfter(oldLast, endCh);

        // Next, merge those two ends
        var sameLine = newText.length == 1, offset = lst(newText).length + (sameLine ? startCh : 0);
        if (first) {
            // Fix up .to properties of first
            for (var i = 0; i < first.length; ++i) {
                var span = first[i];
                if (span.to == null) {
                    var found = getMarkedSpanFor(last, span.marker);
                    if (!found) span.to = startCh;
                    else if (sameLine) span.to = found.to == null ? null : found.to + offset;
                }
            }
        }
        if (last) {
            // Fix up .from in last (or move them into first in case of sameLine)
            for (var i = 0; i < last.length; ++i) {
                var span = last[i];
                if (span.to != null) span.to += offset;
                if (span.from == null) {
                    var found = getMarkedSpanFor(first, span.marker);
                    if (!found) {
                        span.from = offset;
                        if (sameLine) (first || (first = [])).push(span);
                    }
                } else {
                    span.from += offset;
                    if (sameLine) (first || (first = [])).push(span);
                }
            }
        }

        var newMarkers = [newHL(newText[0], first)];
        if (!sameLine) {
            // Fill gap with whole-line-spans
            var gap = newText.length - 2, gapMarkers;
            if (gap > 0 && first)
                for (var i = 0; i < first.length; ++i)
                    if (first[i].to == null)
                        (gapMarkers || (gapMarkers = [])).push({from: null, to: null, marker: first[i].marker});
            for (var i = 0; i < gap; ++i)
                newMarkers.push(newHL(newText[i + 1], gapMarkers));
            newMarkers.push(newHL(lst(newText), last));
        }
        return newMarkers;
    }

    // hl stands for history-line, a data structure that can be either a
    // string (line without markers) or a {text, markedSpans} object.
    function hlText(val) {
        return typeof val == "string" ? val : val.text;
    }

    function hlSpans(val) {
        if (typeof val == "string") return null;
        var spans = val.markedSpans, out = null;
        for (var i = 0; i < spans.length; ++i) {
            if (spans[i].marker.explicitlyCleared) {
                if (!out) out = spans.slice(0, i);
            }
            else if (out) out.push(spans[i]);
        }
        return !out ? spans : out.length ? out : null;
    }

    function newHL(text, spans) {
        return spans ? {text: text, markedSpans: spans} : text;
    }

    function detachMarkedSpans(line) {
        var spans = line.markedSpans;
        if (!spans) return;
        for (var i = 0; i < spans.length; ++i) {
            var lines = spans[i].marker.lines;
            var ix = indexOf(lines, line);
            lines.splice(ix, 1);
        }
        line.markedSpans = null;
    }

    function attachMarkedSpans(line, spans) {
        if (!spans) return;
        for (var i = 0; i < spans.length; ++i)
             var marker = spans[i].marker.lines.push(line);
        line.markedSpans = spans;
    }

    // When measuring the position of the end of a line, different
    // browsers require different approaches. If an empty span is added,
    // many browsers report bogus offsets. Of those, some (Webkit,
    // recent IE) will accept a space without moving the whole span to
    // the next line when wrapping it, others work with a zero-width
    // space.
    var eolSpanContent = " ";
    if (gecko || (ie && !ie_lt8)) eolSpanContent = "\u200b";
    else if (opera) eolSpanContent = "";

    // Line objects. These hold state related to a line, including
    // highlighting info (the styles array).
    function Line(text, markedSpans) {
        this.text = text;
        this.height = 1;
        attachMarkedSpans(this, markedSpans);
    }

    Line.prototype = {
        update: function (text, markedSpans) {
            this.text = text;
            this.stateAfter = this.styles = null;
            detachMarkedSpans(this);
            attachMarkedSpans(this, markedSpans);
        },
        // Run the given mode's parser over a line, update the styles
        // array, which contains alternating fragments of text and CSS
        // classes.
        highlight: function (mode, state, tabSize) {
            var stream = new StringStream(this.text, tabSize), st = this.styles || (this.styles = []);
            var pos = st.length = 0;
            if (this.text == "" && mode.blankLine) mode.blankLine(state);
            while (!stream.eol()) {
                var style = mode.token(stream, state), substr = stream.current();
                stream.start = stream.pos;
                if (pos && st[pos - 1] == style) {
                    st[pos - 2] += substr;
                } else if (substr) {
                    st[pos++] = substr;
                    st[pos++] = style;
                }
                // Give up when line is ridiculously long
                if (stream.pos > 5000) {
                    st[pos++] = this.text.slice(stream.pos);
                    st[pos++] = null;
                    break;
                }
            }
        },
        process: function (mode, state, tabSize) {
            var stream = new StringStream(this.text, tabSize);
            if (this.text == "" && mode.blankLine) mode.blankLine(state);
            while (!stream.eol() && stream.pos <= 5000) {
                mode.token(stream, state);
                stream.start = stream.pos;
            }
        },
        // Fetch the parser token for a given character. Useful for hacks
        // that want to inspect the mode state (say, for completion).
        getTokenAt: function (mode, state, tabSize, ch) {
            var txt = this.text, stream = new StringStream(txt, tabSize);
            while (stream.pos < ch && !stream.eol()) {
                stream.start = stream.pos;
                var style = mode.token(stream, state);
            }
            return {
                start: stream.start,
                end: stream.pos,
                string: stream.current(),
                className: style || null,
                state: state
            };
        },
        indentation: function (tabSize) {
            return countColumn(this.text, null, tabSize);
        },
        // Produces an HTML fragment for the line, taking selection,
        // marking, and highlighting into account.
        getContent: function (tabSize, wrapAt, compensateForWrapping) {
            var first = true, col = 0, specials = /[\t\u0000-\u0019\u200b\u2028\u2029\uFEFF]/g;
            var pre = elt("pre");

            function span_(html, text, style) {
                if (!text) return;
                // Work around a bug where, in some compat modes, IE ignores leading spaces
                if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
                first = false;
                if (!specials.test(text)) {
                    col += text.length;
                    var content = document.createTextNode(text);
                } else {
                    var content = document.createDocumentFragment(), pos = 0;
                    while (true) {
                        specials.lastIndex = pos;
                        var m = specials.exec(text);
                        var skipped = m ? m.index - pos : text.length - pos;
                        if (skipped) {
                            content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));
                            col += skipped;
                        }
                        if (!m) break;
                        pos += skipped + 1;
                        if (m[0] == "\t") {
                            var tabWidth = tabSize - col % tabSize;
                            content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
                            col += tabWidth;
                        } else {
                            var token = elt("span", "\u2022", "cm-invalidchar");
                            token.title = "\\u" + m[0].charCodeAt(0).toString(16);
                            content.appendChild(token);
                            col += 1;
                        }
                    }
                }
                if (style) html.appendChild(elt("span", [content], style));
                else html.appendChild(content);
            }

            var span = span_;
            if (wrapAt != null) {
                var outPos = 0, anchor = pre.anchor = elt("span");
                span = function (html, text, style) {
                    var l = text.length;
                    if (wrapAt >= outPos && wrapAt < outPos + l) {
                        var cut = wrapAt - outPos;
                        if (cut) {
                            span_(html, text.slice(0, cut), style);
                            // See comment at the definition of spanAffectsWrapping
                            if (compensateForWrapping) {
                                var view = text.slice(cut - 1, cut + 1);
                                if (spanAffectsWrapping.test(view)) html.appendChild(elt("wbr"));
                                else if (!ie_lt8 && /\w\w/.test(view)) html.appendChild(document.createTextNode("\u200d"));
                            }
                        }
                        html.appendChild(anchor);
                        span_(anchor, opera ? text.slice(cut, cut + 1) : text.slice(cut), style);
                        if (opera) span_(html, text.slice(cut + 1), style);
                        wrapAt--;
                        outPos += l;
                    } else {
                        outPos += l;
                        span_(html, text, style);
                        if (outPos == wrapAt && outPos == len) {
                            setTextContent(anchor, eolSpanContent);
                            html.appendChild(anchor);
                        }
                        // Stop outputting HTML when gone sufficiently far beyond measure
                        else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function () {
                        };
                    }
                };
            }

            var st = this.styles, allText = this.text, marked = this.markedSpans;
            var len = allText.length;

            function styleToClass(style) {
                if (!style) return null;
                return "cm-" + style.replace(/ +/g, " cm-");
            }

            if (!allText && wrapAt == null) {
                span(pre, " ");
            } else if (!marked || !marked.length) {
                for (var i = 0, ch = 0; ch < len; i += 2) {
                    var str = st[i], style = st[i + 1], l = str.length;
                    if (ch + l > len) str = str.slice(0, len - ch);
                    ch += l;
                    span(pre, str, styleToClass(style));
                }
            } else {
                marked.sort(function (a, b) {
                    return a.from - b.from;
                });
                var pos = 0, i = 0, text = "", style, sg = 0;
                var nextChange = marked[0].from || 0, marks = [], markpos = 0;
                var advanceMarks = function () {
                    var m;
                    while (markpos < marked.length &&
                    ((m = marked[markpos]).from == pos || m.from == null)) {
                        if (m.marker.type == "range") marks.push(m);
                        ++markpos;
                    }
                    nextChange = markpos < marked.length ? marked[markpos].from : Infinity;
                    for (var i = 0; i < marks.length; ++i) {
                        var to = marks[i].to;
                        if (to == null) to = Infinity;
                        if (to == pos) marks.splice(i--, 1);
                        else nextChange = Math.min(to, nextChange);
                    }
                };
                var m = 0;
                while (pos < len) {
                    if (nextChange == pos) advanceMarks();
                    var upto = Math.min(len, nextChange);
                    while (true) {
                        if (text) {
                            var end = pos + text.length;
                            var appliedStyle = style;
                            for (var j = 0; j < marks.length; ++j) {
                                var mark = marks[j];
                                appliedStyle = (appliedStyle ? appliedStyle + " " : "") + mark.marker.style;
                                if (mark.marker.endStyle && mark.to === Math.min(end, upto)) appliedStyle += " " + mark.marker.endStyle;
                                if (mark.marker.startStyle && mark.from === pos) appliedStyle += " " + mark.marker.startStyle;
                            }
                            span(pre, end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
                            if (end >= upto) {
                                text = text.slice(upto - pos);
                                pos = upto;
                                break;
                            }
                            pos = end;
                        }
                        text = st[i++];
                        style = styleToClass(st[i++]);
                    }
                }
            }
            return pre;
        },
        cleanUp: function () {
            this.parent = null;
            detachMarkedSpans(this);
        }
    };

    // Data structure that holds the sequence of lines.
    function LeafChunk(lines) {
        this.lines = lines;
        this.parent = null;
        for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
            lines[i].parent = this;
            height += lines[i].height;
        }
        this.height = height;
    }

    LeafChunk.prototype = {
        chunkSize: function () {
            return this.lines.length;
        },
        remove: function (at, n, callbacks) {
            for (var i = at, e = at + n; i < e; ++i) {
                var line = this.lines[i];
                this.height -= line.height;
                line.cleanUp();
                if (line.handlers)
                    for (var j = 0; j < line.handlers.length; ++j) callbacks.push(line.handlers[j]);
            }
            this.lines.splice(at, n);
        },
        collapse: function (lines) {
            lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
        },
        insertHeight: function (at, lines, height) {
            this.height += height;
            this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
            for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;
        },
        iterN: function (at, n, op) {
            for (var e = at + n; at < e; ++at)
                if (op(this.lines[at])) return true;
        }
    };
    function BranchChunk(children) {
        this.children = children;
        var size = 0, height = 0;
        for (var i = 0, e = children.length; i < e; ++i) {
            var ch = children[i];
            size += ch.chunkSize();
            height += ch.height;
            ch.parent = this;
        }
        this.size = size;
        this.height = height;
        this.parent = null;
    }

    BranchChunk.prototype = {
        chunkSize: function () {
            return this.size;
        },
        remove: function (at, n, callbacks) {
            this.size -= n;
            for (var i = 0; i < this.children.length; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at < sz) {
                    var rm = Math.min(n, sz - at), oldHeight = child.height;
                    child.remove(at, rm, callbacks);
                    this.height -= oldHeight - child.height;
                    if (sz == rm) {
                        this.children.splice(i--, 1);
                        child.parent = null;
                    }
                    if ((n -= rm) == 0) break;
                    at = 0;
                } else at -= sz;
            }
            if (this.size - n < 25) {
                var lines = [];
                this.collapse(lines);
                this.children = [new LeafChunk(lines)];
                this.children[0].parent = this;
            }
        },
        collapse: function (lines) {
            for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
        },
        insert: function (at, lines) {
            var height = 0;
            for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
            this.insertHeight(at, lines, height);
        },
        insertHeight: function (at, lines, height) {
            this.size += lines.length;
            this.height += height;
            for (var i = 0, e = this.children.length; i < e; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at <= sz) {
                    child.insertHeight(at, lines, height);
                    if (child.lines && child.lines.length > 50) {
                        while (child.lines.length > 50) {
                            var spilled = child.lines.splice(child.lines.length - 25, 25);
                            var newleaf = new LeafChunk(spilled);
                            child.height -= newleaf.height;
                            this.children.splice(i + 1, 0, newleaf);
                            newleaf.parent = this;
                        }
                        this.maybeSpill();
                    }
                    break;
                }
                at -= sz;
            }
        },
        maybeSpill: function () {
            if (this.children.length <= 10) return;
            var me = this;
            do {
                var spilled = me.children.splice(me.children.length - 5, 5);
                var sibling = new BranchChunk(spilled);
                if (!me.parent) { // Become the parent node
                    var copy = new BranchChunk(me.children);
                    copy.parent = me;
                    me.children = [copy, sibling];
                    me = copy;
                } else {
                    me.size -= sibling.size;
                    me.height -= sibling.height;
                    var myIndex = indexOf(me.parent.children, me);
                    me.parent.children.splice(myIndex + 1, 0, sibling);
                }
                sibling.parent = me.parent;
            } while (me.children.length > 10);
            me.parent.maybeSpill();
        },
        iter: function (from, to, op) {
            this.iterN(from, to - from, op);
        },
        iterN: function (at, n, op) {
            for (var i = 0, e = this.children.length; i < e; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at < sz) {
                    var used = Math.min(n, sz - at);
                    if (child.iterN(at, used, op)) return true;
                    if ((n -= used) == 0) break;
                    at = 0;
                } else at -= sz;
            }
        }
    };

    function getLineAt(chunk, n) {
        while (!chunk.lines) {
            for (var i = 0; ; ++i) {
                var child = chunk.children[i], sz = child.chunkSize();
                if (n < sz) {
                    chunk = child;
                    break;
                }
                n -= sz;
            }
        }
        return chunk.lines[n];
    }

    function lineNo(line) {
        if (line.parent == null) return null;
        var cur = line.parent, no = indexOf(cur.lines, line);
        for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
            for (var i = 0, e = chunk.children.length; ; ++i) {
                if (chunk.children[i] == cur) break;
                no += chunk.children[i].chunkSize();
            }
        }
        return no;
    }

    function lineAtHeight(chunk, h) {
        var n = 0;
        outer: do {
            for (var i = 0, e = chunk.children.length; i < e; ++i) {
                var child = chunk.children[i], ch = child.height;
                if (h < ch) {
                    chunk = child;
                    continue outer;
                }
                h -= ch;
                n += child.chunkSize();
            }
            return n;
        } while (!chunk.lines);
        for (var i = 0, e = chunk.lines.length; i < e; ++i) {
            var line = chunk.lines[i], lh = line.height;
            if (h < lh) break;
            h -= lh;
        }
        return n + i;
    }

    function heightAtLine(chunk, n) {
        var h = 0;
        outer: do {
            for (var i = 0, e = chunk.children.length; i < e; ++i) {
                var child = chunk.children[i], sz = child.chunkSize();
                if (n < sz) {
                    chunk = child;
                    continue outer;
                }
                n -= sz;
                h += child.height;
            }
            return h;
        } while (!chunk.lines);
        for (var i = 0; i < n; ++i) h += chunk.lines[i].height;
        return h;
    }

    // The history object 'chunks' changes that are made close together
    // and at almost the same time into bigger undoable units.
    function History() {
        this.time = 0;
        this.done = [];
        this.undone = [];
        this.compound = 0;
        this.closed = false;
    }

    History.prototype = {
        addChange: function (start, added, old) {
            this.undone.length = 0;
            var time = +new Date, cur = lst(this.done), last = cur && lst(cur);
            var dtime = time - this.time;

            if (cur && !this.closed && this.compound) {
                cur.push({start: start, added: added, old: old});
            } else if (dtime > 400 || !last || this.closed ||
                last.start > start + old.length || last.start + last.added < start) {
                this.done.push([{start: start, added: added, old: old}]);
                this.closed = false;
            } else {
                var startBefore = Math.max(0, last.start - start),
                    endAfter = Math.max(0, (start + old.length) - (last.start + last.added));
                for (var i = startBefore; i > 0; --i) last.old.unshift(old[i - 1]);
                for (var i = endAfter; i > 0; --i) last.old.push(old[old.length - i]);
                if (startBefore) last.start = start;
                last.added += added - (old.length - startBefore - endAfter);
            }
            this.time = time;
        },
        startCompound: function () {
            if (!this.compound++) this.closed = true;
        },
        endCompound: function () {
            if (!--this.compound) this.closed = true;
        }
    };

    function stopMethod() {
        e_stop(this);
    }

    // Ensure an event has a stop method.
    function addStop(event) {
        if (!event.stop) event.stop = stopMethod;
        return event;
    }

    function e_preventDefault(e) {
        if (e.preventDefault) e.preventDefault();
        else e.returnValue = false;
    }

    function e_stopPropagation(e) {
        if (e.stopPropagation) e.stopPropagation();
        else e.cancelBubble = true;
    }

    function e_stop(e) {
        e_preventDefault(e);
        e_stopPropagation(e);
    }

    CodeMirror.e_stop = e_stop;
    CodeMirror.e_preventDefault = e_preventDefault;
    CodeMirror.e_stopPropagation = e_stopPropagation;

    function e_target(e) {
        return e.target || e.srcElement;
    }

    function e_button(e) {
        var b = e.which;
        if (b == null) {
            if (e.button & 1) b = 1;
            else if (e.button & 2) b = 3;
            else if (e.button & 4) b = 2;
        }
        if (mac && e.ctrlKey && b == 1) b = 3;
        return b;
    }

    // Allow 3rd-party code to override event properties by adding an override
    // object to an event object.
    function e_prop(e, prop) {
        var overridden = e.override && e.override.hasOwnProperty(prop);
        return overridden ? e.override[prop] : e[prop];
    }

    // Event handler registration. If disconnect is true, it'll return a
    // function that unregisters the handler.
    function connect(node, type, handler, disconnect) {
        if (typeof node.addEventListener == "function") {
            node.addEventListener(type, handler, false);
            if (disconnect) return function () {
                node.removeEventListener(type, handler, false);
            };
        } else {
            var wrapHandler = function (event) {
                handler(event || window.event);
            };
            node.attachEvent("on" + type, wrapHandler);
            if (disconnect) return function () {
                node.detachEvent("on" + type, wrapHandler);
            };
        }
    }

    CodeMirror.connect = connect;

    function Delayed() {
        this.id = null;
    }

    Delayed.prototype = {
        set: function (ms, f) {
            clearTimeout(this.id);
            this.id = setTimeout(f, ms);
        }
    };

    var Pass = CodeMirror.Pass = {
        toString: function () {
            return "CodeMirror.Pass";
        }
    };

    // Detect drag-and-drop
    var dragAndDrop = function () {
        // There is *some* kind of drag-and-drop support in IE6-8, but I
        // couldn't get it to work yet.
        if (ie_lt9) return false;
        var div = elt('div');
        return "draggable" in div || "dragDrop" in div;
    }();

    // Feature-detect whether newlines in textareas are converted to \r\n
    var lineSep = function () {
        var te = elt("textarea");
        te.value = "foo\nbar";
        if (te.value.indexOf("\r") > -1) return "\r\n";
        return "\n";
    }();

    // For a reason I have yet to figure out, some browsers disallow
    // word wrapping between certain characters *only* if a new inline
    // element is started between them. This makes it hard to reliably
    // measure the position of things, since that requires inserting an
    // extra span. This terribly fragile set of regexps matches the
    // character combinations that suffer from this phenomenon on the
    // various browsers.
    var spanAffectsWrapping = /^$/; // Won't match any two-character string
    if (gecko) spanAffectsWrapping = /$'/;
    else if (safari) spanAffectsWrapping = /\-[^ \-?]|\?[^ !'\"\),.\-\/:;\?\]\}]/;
    else if (chrome) spanAffectsWrapping = /\-[^ \-\.?]|\?[^ \-\.?\]\}:;!'\"\),\/]|[\.!\"#&%\)*+,:;=>\]|\}~][\(\{\[<]|\$'/;

    // Counts the column offset in a string, taking tabs into account.
    // Used mostly to find indentation.
    function countColumn(string, end, tabSize) {
        if (end == null) {
            end = string.search(/[^\s\u00a0]/);
            if (end == -1) end = string.length;
        }
        for (var i = 0, n = 0; i < end; ++i) {
            if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
            else ++n;
        }
        return n;
    }

    function eltOffset(node, screen) {
        // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
        // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
        try {
            var box = node.getBoundingClientRect();
            box = {top: box.top, left: box.left};
        }
        catch (e) {
            box = {top: 0, left: 0};
        }
        if (!screen) {
            // Get the toplevel scroll, working around browser differences.
            if (window.pageYOffset == null) {
                var t = document.documentElement || document.body.parentNode;
                if (t.scrollTop == null) t = document.body;
                box.top += t.scrollTop;
                box.left += t.scrollLeft;
            } else {
                box.top += window.pageYOffset;
                box.left += window.pageXOffset;
            }
        }
        return box;
    }

    function eltText(node) {
        return node.textContent || node.innerText || node.nodeValue || "";
    }

    var spaceStrs = [""];

    function spaceStr(n) {
        while (spaceStrs.length <= n)
            spaceStrs.push(lst(spaceStrs) + " ");
        return spaceStrs[n];
    }

    function lst(arr) {
        return arr[arr.length - 1];
    }

    function selectInput(node) {
        if (ios) { // Mobile Safari apparently has a bug where select() is broken.
            node.selectionStart = 0;
            node.selectionEnd = node.value.length;
        } else node.select();
    }

    // Operations on {line, ch} objects.
    function posEq(a, b) {
        return a.line == b.line && a.ch == b.ch;
    }

    function posLess(a, b) {
        return a.line < b.line || (a.line == b.line && a.ch < b.ch);
    }

    function copyPos(x) {
        return {line: x.line, ch: x.ch};
    }

    function elt(tag, content, className, style) {
        var e = document.createElement(tag);
        if (className) e.className = className;
        if (style) e.style.cssText = style;
        if (typeof content == "string") setTextContent(e, content);
        else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
        return e;
    }

    function removeChildren(e) {
        e.innerHTML = "";
        return e;
    }

    function removeChildrenAndAdd(parent, e) {
        removeChildren(parent).appendChild(e);
    }

    function setTextContent(e, str) {
        if (ie_lt9) {
            e.innerHTML = "";
            e.appendChild(document.createTextNode(str));
        } else e.textContent = str;
    }

    // Used to position the cursor after an undo/redo by finding the
    // last edited character.
    function editEnd(from, to) {
        if (!to) return 0;
        if (!from) return to.length;
        for (var i = from.length, j = to.length; i >= 0 && j >= 0; --i, --j)
            if (from.charAt(i) != to.charAt(j)) break;
        return j + 1;
    }

    function indexOf(collection, elt) {
        if (collection.indexOf) return collection.indexOf(elt);
        for (var i = 0, e = collection.length; i < e; ++i)
            if (collection[i] == elt) return i;
        return -1;
    }

    function isWordChar(ch) {
        return /\w/.test(ch) || ch.toUpperCase() != ch.toLowerCase() || /[\u4E00-\u9FA5]/.test(ch);
    }

    // See if "".split is the broken IE version, if so, provide an
    // alternative way to split lines.
    var splitLines = "\n\nb".split(/\n/).length != 3 ? function (string) {
        var pos = 0, result = [], l = string.length;
        while (pos <= l) {
            var nl = string.indexOf("\n", pos);
            if (nl == -1) nl = string.length;
            var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
            var rt = line.indexOf("\r");
            if (rt != -1) {
                result.push(line.slice(0, rt));
                pos += rt + 1;
            } else {
                result.push(line);
                pos = nl + 1;
            }
        }
        return result;
    } : function (string) {
        return string.split(/\r\n?|\n/);
    };
    CodeMirror.splitLines = splitLines;

    var hasSelection = window.getSelection ? function (te) {
        try {
            return te.selectionStart != te.selectionEnd;
        }
        catch (e) {
            return false;
        }
    } : function (te) {
        try {
            var range = te.ownerDocument.selection.createRange();
        }
        catch (e) {
        }
        if (!range || range.parentElement() != te) return false;
        return range.compareEndPoints("StartToEnd", range) != 0;
    };

    CodeMirror.defineMode("null", function () {
        return {
            token: function (stream) {
                stream.skipToEnd();
            }
        };
    });
    CodeMirror.defineMIME("text/plain", "null");

    var keyNames = {
        3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
        19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
        36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
        46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 109: "-", 107: "=", 127: "Delete",
        186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
        221: "]", 222: "'", 63276: "PageUp", 63277: "PageDown", 63275: "End", 63273: "Home",
        63234: "Left", 63232: "Up", 63235: "Right", 63233: "Down", 63302: "Insert", 63272: "Delete"
    };
    CodeMirror.keyNames = keyNames;
    (function () {
        // Number keys
        for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);
        // Alphabetic keys
        for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
        // Function keys
        for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
    })();

    CodeMirror.version = "2.35";

    return CodeMirror;
})();
